Python289 questions in the bank

Python Quiz: Test Your Python Knowledge

Pick how many questions you want, choose a difficulty and go. You'll see why each answer is right or wrong, then you can retry to beat your score.

Questions
Difficulty
Topic
Mode

  1. Which command checks which version of Python is installed?

    • python -check
    • print(version)
    • python install
    • python --version

  2. What file extension do Python script files use?

    • .pt
    • .pyt
    • .py
    • .python

  3. What does print(10 / 4) show?

    • 2.5
    • 2
    • 2.0
    • 2 remainder 2

  4. What happens if a line starts with an unexpected space?

    • Python ignores the space
    • Python raises an IndentationError
    • The line becomes a comment
    • The line runs twice

  5. Which file extension do Python programs use?

    • .pt
    • .pyt
    • .python
    • .py

  6. What defines a Python statement block?

    • Curly braces
    • Consistent indentation
    • Python ignores the distinction

  7. Which statement correctly describes continuation?

    • Parentheses allow long expressions to continue across physical lines.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  8. What does # inside quoted text represent?

    • A comment marker
    • A character in the string
    • Python ignores the distinction

  9. Which statement correctly describes docstrings?

    • The opening string in a function, class or module documents its public purpose.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  10. Which keyword changes the text between printed arguments?

    • end
    • sep
    • Python ignores the distinction

  11. Which statement correctly describes line endings?

    • end sets the text following the final argument.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  12. What type is the value 3.0?

    • int
    • str
    • float
    • bool

  13. Which variable name follows Python's usual style?

    • total_price
    • TotalPrice
    • totalprice!
    • total-price

  14. What does input() always return?

    • An int
    • Whatever type the user typed
    • A boolean
    • A string

  15. What does print(f"{7 / 2:.1f}") show?

    • 3.5
    • 3
    • 3.50
    • 7 / 2

  16. What does type(int("7") + 0.5) give?

    • <class 'int'>
    • <class 'float'>
    • <class 'str'>
    • An error

  17. What does a = b = [] create?

    • Two independent lists
    • Two references to one list
    • Python ignores the distinction

  18. Which statement correctly describes swapping?

    • The right side is evaluated before its values are assigned to targets.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  19. What does 2 ** 3 equal?

    • 8
    • 6
    • 5
    • 9

  20. What type is the result of 10 / 5?

    • int
    • str
    • bool
    • float

  21. What does round(3.14159, 2) return?

    • 3.14
    • 3.1
    • 3.142
    • 3

  22. Why does 0.1 + 0.2 print 0.30000000000000004?

    • Python has a bug
    • The numbers are strings
    • Some decimals can't be stored exactly in binary
    • round() was missing

  23. What does -7 // 2 give?

    • -3
    • -3.5
    • 3
    • -4

  24. What does int(-3.8) produce?

    • -4
    • -3
    • Python ignores the distinction

  25. Which statement correctly describes truncation?

    • int applied to a finite float discards the fractional part toward zero.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  26. Which test specifically checks for None?

    • not value
    • value is None
    • Python ignores the distinction

  27. Which statement correctly describes implicit results?

    • Functions with no explicit returned value produce None.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  28. What is the index of the first character in a Python string?

    • 1
    • -1
    • It depends on the string
    • 0

  29. Which method removes spaces from both ends of a string?

    • trim()
    • clean()
    • strip()
    • cut()

  30. What does "hello"[::-1] return?

    • "hello"
    • "olleh"
    • "h"
    • An error

  31. Why does s.upper() on its own not change s?

    • upper() only works inside print()
    • Strings are immutable, so upper() returns a new string
    • You must call it twice
    • upper() only changes the first letter

  32. What does "a,b,,c".split(",") return?

    • ['a', 'b', 'c']
    • ['a,b,,c']
    • ['a', 'b', '', 'c']
    • ['a', 'b', ',', 'c']

  33. What does f"{7:03d}" produce?

    • 7
    • 700
    • 007
    • 3d7

  34. Which alignment character centres text?

    • <
    • >
    • =
    • ^

  35. What does "{:>6.1f}".format(3.14159) produce?

    • "3.1 "
    • " 3.1" (right-aligned in 6 characters)
    • "3.14159"
    • " 3.14"

  36. How do you print a literal { inside an f-string?

    • {{
    • \{
    • '{'
    • It isn't possible

  37. Why is it better to format values at the moment you print them?

    • Formatting is slow
    • f-strings can only be used in print()
    • Formatted values are strings, so calculating with them gives wrong results or errors
    • Python forgets formatting after one line

  38. Which type does input return?

    • int
    • str
    • Python ignores the distinction

  39. Which statement correctly describes validation?

    • Conversion checks the representation, and range checks enforce the application rule.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  40. What is bool("0")?

    • False
    • True
    • Python ignores the distinction

  41. Which statement correctly describes truthiness?

    • Zero, empty collections and None are false in conditions.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  42. What does 2 + 3 * 4 evaluate to?

    • 20
    • 14
    • Python ignores the distinction

  43. Which statement correctly describes membership and bits?

    • in checks containment while bitwise operators combine integer bit patterns.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  44. What does == do in Python?

    • Stores a value
    • Checks whether two values are equal
    • Checks whether two values are different
    • Joins two strings

  45. What must come at the end of an if line?

    • A semicolon
    • Curly braces
    • Nothing
    • A colon

  46. How many branches of an if/elif/else chain can run at once?

    • All the true ones
    • Exactly two
    • At most one
    • It depends on the indentation

  47. What is the value of not (5 > 3 and 2 > 4)?

    • True
    • False
    • None
    • An error

  48. What does not (5 > 3) evaluate to?

    • False
    • True
    • 5
    • An error

  49. What does a bare name normally do in a match pattern?

    • Look up an existing constant
    • Capture a value
    • Python ignores the distinction

  50. Which statement correctly describes guards?

    • A case guard checks an additional condition after its pattern succeeds.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  51. Does pass skip the rest of a loop iteration?

    • Yes
    • No
    • Python ignores the distinction

  52. Which statement correctly describes loop behavior?

    • pass does not skip later work in a loop iteration.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  53. Which numbers does range(4) produce?

    • 1, 2, 3, 4
    • 0, 1, 2, 3, 4
    • 0, 1, 2, 3
    • 4

  54. Which loop is best when you don't know how many repeats you need?

    • for
    • range
    • if
    • while

  55. What does break do inside a loop?

    • Exits the loop immediately
    • Pauses the loop for a moment
    • Skips one pass
    • Restarts the loop

  56. How many times does print run here: for i in range(10, 0, -2): print(i)?

    • 4
    • 5
    • 6
    • 10

  57. What does continue do inside a loop?

    • Ends the loop completely
    • Restarts the loop from the beginning
    • Skips the rest of this pass and moves on to the next one
    • Pauses the program

  58. What is the index of the first item in a Python list?

    • 1
    • 0
    • -1
    • It depends on the list

  59. What does len(["x", "y", "z"]) return?

    • 2
    • "xyz"
    • 0
    • 3

  60. What's the difference between my_list.sort() and sorted(my_list)?

    • There is no difference
    • sorted() changes the list itself; sort() returns a new list
    • sort() changes the list itself; sorted() returns a new sorted list
    • sort() only works on numbers

  61. What is ["a", "b", "c", "d", "e"][-2:]?

    • ['d', 'e']
    • ['d']
    • ['c', 'd']
    • ['e']

  62. What's the difference between append and extend?

    • There's none
    • extend adds to the front
    • append sorts the list
    • append adds one item; extend adds every item from another list

  63. Which brackets create a dictionary?

    • { }
    • [ ]
    • ( )
    • < >

  64. What happens when you read a missing key with square brackets?

    • It returns None
    • Python raises a KeyError
    • It returns 0
    • It adds the key

  65. What does d.get("age", 18) return if "age" isn't in d?

    • None
    • 18
    • "age"
    • A KeyError

  66. Which of these can be a dictionary key?

    • A list such as [1, 2]
    • Another dictionary
    • A set
    • A tuple such as (1, 2)

  67. In what order does a loop over a Python 3.7+ dictionary visit the keys?

    • Alphabetical order
    • Random order
    • The order the keys were added
    • Sorted by value

  68. What makes a tuple different from a list?

    • Tuples can only hold numbers
    • Tuples are unordered
    • Tuples can't be changed after they're created
    • Tuples use square brackets

  69. What happens if you add a value that's already in a set?

    • An error
    • It's added twice
    • The old value is replaced
    • Nothing, sets keep only unique values

  70. What does a, b = b, a do?

    • Swaps the values of a and b
    • Raises an error
    • Makes both variables equal to a
    • Creates a list

  71. Which operator gives the items found in both sets?

    • |
    • &
    • -
    • +

  72. Why is ("red") not a tuple?

    • It's the comma that makes a tuple; this is just a string in brackets
    • Tuples can't contain strings
    • Tuples need at least three items
    • It needs square brackets

  73. Which boundary is excluded by range?

    • The start
    • The stop
    • Python ignores the distinction

  74. Which statement correctly describes compact storage?

    • A range stores its defining parameters rather than a list of every generated integer.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  75. What restricts values in array.array?

    • Nothing
    • Its selected type code
    • Python ignores the distinction

  76. Which statement correctly describes sequence operations?

    • Typed arrays support indexing, slices and compatible append operations.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  77. Which operation finds shared set members?

    • Union
    • Intersection
    • Python ignores the distinction

  78. Which statement correctly describes set algebra?

    • Union, intersection, difference and symmetric difference answer different membership questions.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  79. What stays shared after a shallow copy?

    • The new outer container
    • Nested objects
    • Python ignores the distinction

  80. Which statement correctly describes deep copies?

    • deepcopy recursively copies supported structures and tracks previously copied objects.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  81. Which keyword defines a function in Python?

    • function
    • def
    • func
    • define

  82. What does a function return if it has no return statement?

    • 0
    • An empty string
    • None
    • An error

  83. In def area(w, h): and area(3, 4), what are 3 and 4?

    • Parameters
    • Return values
    • Defaults
    • Arguments

  84. What does this print? def f(x): return x * 2 then print(f(f(3)))

    • 12
    • 6
    • 9
    • 36

  85. Which call uses a keyword argument?

    • greet("Ada")
    • greet(name="Ada")
    • greet["Ada"]
    • greet.name("Ada")

  86. What type is args inside def f(*args):?

    • list
    • dict
    • set
    • tuple

  87. What type is kwargs inside def f(**kwargs):?

    • list
    • tuple
    • str
    • dict

  88. What does print(*[1, 2, 3]) print?

    • [1, 2, 3]
    • 1 2 3
    • 123
    • (1, 2, 3)

  89. What happens to a local variable when its function finishes?

    • It disappears
    • It becomes global
    • It's saved for the next call
    • It's printed

  90. What's the safe default for a parameter that should start as an empty list?

    • basket=[]
    • basket=list
    • basket=None, then create a list inside the function
    • basket=()

  91. What terminates recursive descent?

    • A print statement
    • A reachable base case
    • Python ignores the distinction

  92. Which statement correctly describes call stack?

    • Active calls keep separate local state until deeper calls return.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  93. What does a list comprehension return?

    • The original list, changed
    • A new list
    • A string
    • None

  94. In [x for x in items if x > 0], what does the if do?

    • Keeps only items where the condition is true
    • Changes every item
    • Stops the loop
    • Sorts the items

  95. What is a lambda?

    • A loop
    • A small, unnamed function written as one expression
    • A kind of list
    • A module

  96. What does key= do in sorted(items, key=...)?

    • Encrypts the items
    • Removes duplicates
    • Tells sorted() which value to compare for each item
    • Sorts in reverse

  97. What does {w.lower() for w in ["A", "a", "B"]} produce?

    • ['a', 'a', 'b']
    • {'A': 'a', 'B': 'b'}
    • An error
    • {'a', 'b'}

  98. Where should you start reading a traceback?

    • At the top
    • In the middle
    • It doesn't matter
    • At the bottom, which names the error type and message

  99. Which exception does int("hello") raise?

    • TypeError
    • NameError
    • ValueError
    • KeyError

  100. When does a finally block run?

    • Only when there's an error
    • Always
    • Only when there's no error
    • Never inside functions

  101. What does raise ValueError("Too big") do?

    • Stops normal execution with a ValueError carrying that message
    • Prints "Too big" and continues
    • Fixes the value
    • Creates a variable

  102. When does the else block of a try statement run?

    • When an exception is caught
    • Before the try block
    • Only if there's also a finally
    • When the try block finished without any exception

  103. What does with open(...) guarantee?

    • The file exists
    • The file is empty
    • The file is closed when the block ends
    • The file is read-only

  104. What happens if you open an existing file with mode "w"?

    • The file is emptied before writing
    • An error is raised
    • New text is added to the end
    • Nothing changes

  105. Why add encoding="utf-8" when opening text files?

    • It makes files smaller
    • It's required for CSV files only
    • It encrypts the file
    • So characters such as é or ñ are read and written consistently on every system

  106. What type are the values in a row from csv.DictReader?

    • Strings
    • Numbers where possible
    • Lists
    • Booleans

  107. What does the mode "a" do in open("log.txt", "a")?

    • Opens the file read-only
    • Deletes the file first
    • Adds new text to the end, creating the file if needed
    • Opens it as binary

  108. What is a Python module?

    • A type of loop
    • A built-in data type
    • A .py file containing code you can import
    • An error message

  109. What does import pandas as pd do?

    • Imports pandas and lets you refer to it as pd
    • Renames the pandas package on disk
    • Installs pandas
    • Imports only the pd function

  110. What file is commonly used to list a project's packages?

    • packages.py
    • requirements.txt
    • pip.json
    • modules.cfg

  111. Why should you avoid from module import *?

    • It's slower to type
    • It doesn't work in Python 3
    • It only imports classes
    • It imports every name, making it unclear where names come from and risking clashes

  112. What is a virtual environment for?

    • Running Python in the browser
    • Making code run faster
    • Keeping each project's installed packages separate
    • Hiding your code

  113. What does date.today().year give?

    • The current month
    • The date as text
    • The current year as a number
    • The day of the week

  114. What does timedelta(days=7) represent?

    • A specific date
    • A length of time: one week
    • The seventh day of the month
    • Seven o'clock

  115. What does %B show?

    • The short month name
    • The month number
    • The full month name, such as March
    • The weekday

  116. What does strptime raise if the text doesn't match the format?

    • ValueError
    • TypeError
    • KeyError
    • Nothing, it returns None

  117. What does date(2025, 3, 5).weekday() return, given that 5 March 2025 is a Wednesday?

    • 3
    • 4
    • "Wednesday"
    • 2

  118. How do you create an object from a class called Car?

    • new Car()
    • create Car
    • Car.new()
    • Car()

  119. When does __init__ run?

    • Each time a new object is created
    • When the program starts
    • When the object is printed
    • Only once per class

  120. What is a class attribute?

    • An attribute created inside __init__
    • A private attribute
    • An attribute defined in the class body, shared by all instances
    • A method

  121. What does a leading underscore in _balance mean?

    • It's a syntax error
    • By convention, it's internal and should be changed through methods
    • Python makes it read-only
    • It's a class attribute

  122. Why is items = [] in a class body risky for per-object data?

    • Lists can't be attributes
    • It slows the class down
    • The same list is shared by every object of the class
    • It deletes the list each time

  123. What does a subclass inherit from its parent?

    • Nothing
    • Only its __init__
    • Its attributes and methods
    • Only methods named with underscores

  124. What is method overriding?

    • Deleting a parent method
    • Defining a method in the child with the same name as one in the parent
    • Calling a method twice
    • Making a method private

  125. What does super().__init__(name) do inside a child's __init__?

    • Creates a second object
    • Deletes the parent's attributes
    • Calls the child's __init__ again
    • Runs the parent class's __init__ for this object

  126. What is polymorphism?

    • Different classes responding to the same method call in their own way
    • A class with many attributes
    • A class that inherits from many parents
    • Changing an object's type

  127. When is composition usually better than inheritance?

    • When the relationship is "is a"
    • When there are no methods
    • Never
    • When the relationship is "has a"

  128. Which method is intended for diagnostic representation?

    • __str__ only
    • __repr__
    • Python ignores the distinction

  129. Which statement correctly describes diagnostic text?

    • __repr__ helps developers inspect the important state of an object.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  130. Why store _capacity in the property setter?

    • To enforce secrecy
    • To avoid recursive setter calls
    • Python ignores the distinction

  131. Which statement correctly describes static methods?

    • A staticmethod has no automatic self or cls argument.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  132. Does a nested class automatically receive an outer instance?

    • Yes
    • No
    • Python ignores the distinction

  133. Which statement correctly describes composition?

    • An object can contain a collaborator instead of inheriting its behavior.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  134. Does Python stop the program if an argument doesn't match its type hint?

    • No, hints are checked by tools like editors and mypy, not at run time
    • Yes, always
    • Only for ints
    • Only in classes

  135. Which methods does @dataclass generate by default?

    • Only __init__
    • __str__ and __len__
    • All comparison operators
    • __init__, __repr__ and __eq__

  136. How do you give a dataclass field an empty list as its default?

    • items: list = []
    • items: list[str] = list
    • items: list[str] = field(default_factory=list)
    • items: list[str] = None()

  137. What does -> None on a function mean?

    • It returns zero
    • It can't be called
    • It returns an empty string
    • It doesn't return a value

  138. With @dataclass(order=True) and fields major, minor, how are objects compared?

    • Field by field, starting with major, then minor if major is equal
    • By the order they were created
    • By memory address
    • Alphabetically by class name

  139. Which keyword turns a function into a generator?

    • return
    • yield
    • async
    • gen

  140. What does next() raise when an iterator has no more items?

    • IndexError
    • ValueError
    • StopIteration
    • None

  141. What does lazy evaluation mean?

    • Code runs slowly
    • Errors are ignored
    • Values are produced only when they're needed
    • Functions run in the background

  142. What does list(islice(count(5), 3)) give?

    • [0, 1, 2]
    • [5, 5, 5]
    • [3, 4, 5]
    • [5, 6, 7]

  143. What happens to a generator's local variables between next() calls?

    • They're reset
    • They're kept, because the function is paused, not finished
    • They become global
    • They're deleted

  144. What happens to an exhausted iterator in a for loop?

    • It restarts
    • The loop finishes
    • Python ignores the distinction

  145. Which statement correctly describes exhaustion?

    • StopIteration signals that no next value remains.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  146. Where should essential contextmanager cleanup go?

    • Only before yield
    • In finally around yield
    • Python ignores the distinction

  147. Which statement correctly describes bound value?

    • The result of __enter__ is assigned to the name after as.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  148. What is a decorator?

    • A function that takes a function and returns a modified version of it
    • A comment that styles code
    • A type of class
    • A loop

  149. What is a closure?

    • A function with no return
    • An inner function that remembers variables from the function it was defined in
    • The end of a file
    • A closed file object

  150. What does @lru_cache do?

    • Stores results so repeated calls with the same arguments return instantly
    • Deletes old functions
    • Logs every call
    • Limits recursion

  151. How many nested functions does a decorator with arguments normally have?

    • One
    • Two
    • Three
    • Four

  152. When does a decorator run?

    • Every time the program starts a loop
    • Once, when the decorated function is defined; the wrapper runs on each call
    • Only when an error happens
    • Never, it's just a label

  153. Which module provides regular expressions in Python?

    • regex
    • re
    • string
    • pattern

  154. What does ? mean after a character in a pattern?

    • One or more
    • Zero or more
    • Optional: zero or one
    • Exactly one

  155. What does re.search return when nothing matches?

    • An empty string
    • False
    • None
    • An error

  156. What does \s match?

    • A whitespace character
    • The letter s
    • Any symbol
    • The start of the text

  157. In re.sub(r"(\w+) (\w+)", r"\2 \1", "Ada Lovelace"), what's the result?

    • Ada Lovelace
    • \2 \1
    • AdaLovelace
    • Lovelace Ada

  158. What does an automated test do?

    • Runs code with known inputs and checks the result automatically
    • Speeds up the program
    • Formats code
    • Installs packages

  159. In pytest output, what does F mean?

    • Finished
    • A fixture ran
    • A test failed
    • A file was skipped

  160. What is a fixture?

    • A broken test
    • A type of assert
    • A test file
    • A function that prepares data or resources that tests receive as parameters

  161. How do you compare floats safely in a pytest assert?

    • pytest.approx(expected)
    • round both sides to 0 decimals
    • str(a) == str(b)
    • You can't

  162. You've found a bug. What's a good first step?

    • Delete the related tests
    • Write a test that reproduces the bug, then fix the code until it passes
    • Rewrite the whole module
    • Ignore it if other tests pass

  163. What format do most web APIs use for their responses?

    • CSV
    • PDF
    • HTML only
    • JSON

  164. Which HTTP method is normally used to create something new?

    • POST
    • GET
    • HEAD
    • OPTIONS

  165. What does status code 429 tell you?

    • Success
    • The server crashed
    • You're sending too many requests
    • The page moved

  166. Why always pass timeout=?

    • It makes requests faster
    • Without it, a request to a slow server can wait for ever
    • Some APIs require it
    • It retries failed requests

  167. Which exception catches all errors raised by requests, including connection problems?

    • ValueError
    • requests.RequestException
    • HTTPError only
    • KeyError

  168. Which mode refuses to overwrite an existing file?

    • w
    • x
    • Python ignores the distinction

  169. Which statement correctly describes context lifetime?

    • with closes the file when its block ends.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  170. Which function decodes JSON from a string?

    • json.load
    • json.loads
    • Python ignores the distinction

  171. Which statement correctly describes formatting?

    • indent improves readability and ensure_ascii=False preserves readable Unicode characters.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  172. What type is a numeric field returned by DictReader?

    • int
    • str
    • Python ignores the distinction

  173. Which statement correctly describes writing?

    • DictWriter writes named fields using an explicit field order.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  174. Does creating a Path object create a filesystem entry?

    • Yes
    • No
    • Python ignores the distinction

  175. Which statement correctly describes traversal?

    • iterdir lists immediate children while glob can select matching names.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  176. What does ordinary zip do with unequal iterable lengths?

    • Fill missing values automatically
    • Stop at the shortest
    • Python ignores the distinction

  177. Which statement correctly describes transformation?

    • sorted, reversed, enumerate and zip provide useful traversal transformations.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  178. Which method changes a list in place?

    • sorted
    • list.sort
    • Python ignores the distinction

  179. Which statement correctly describes mappings?

    • keys, values and items expose dictionary views and get reads with a fallback.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  180. Which exception normally describes invalid integer text?

    • KeyError
    • ValueError
    • Python ignores the distinction

  181. Which statement correctly describes filesystem errors?

    • FileNotFoundError, PermissionError and other OSError subclasses describe external resource failures.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  182. Is print normally a reserved Python keyword?

    • Yes
    • No
    • Python ignores the distinction

  183. Which statement correctly describes core vocabulary?

    • An argument is a supplied value, a parameter is a declared input and a return value is a produced result.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  184. Which standard library type counts repeated values?

    • Path
    • Counter
    • Python ignores the distinction

  185. Which statement correctly describes collections?

    • Counter counts values, defaultdict supplies missing defaults and deque supports efficient end operations.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  186. What type does os.getenv return when it finds a value?

    • int
    • str
    • Python ignores the distinction

  187. Which statement correctly describes required configuration?

    • Missing required configuration should produce an actionable startup error.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  188. Which form selects pip for a chosen Python interpreter?

    • An unrelated pip executable
    • python -m pip
    • Python ignores the distinction

  189. Which statement correctly describes installation records?

    • A requirements file records dependency specifications for a reproducible setup.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  190. What makes a useful debugging hypothesis?

    • A random code change
    • A prediction you can test
    • Python ignores the distinction

  191. Which statement correctly describes breakpoints?

    • breakpoint enters the configured debugger so execution state can be inspected.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  192. Where does logger.exception normally capture exception context?

    • Before any exception occurs
    • Inside an exception handler
    • Python ignores the distinction

  193. Which statement correctly describes deferred formatting?

    • Passing a format string and arguments defers message interpolation until needed.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  194. Why test an exact capacity boundary?

    • To guarantee every possible input
    • To detect off by one mistakes
    • Python ignores the distinction

  195. Which statement correctly describes parameterization?

    • Parametrized cases check several boundary inputs using one declared test contract.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  196. Where should a dependency usually be patched?

    • Only in its original module
    • Where the tested code looks it up
    • Python ignores the distinction

  197. Which statement correctly describes patching locations?

    • Patch the name used by the code under test rather than guessing its original definition location.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  198. Which style commonly names Python functions?

    • CapWords
    • snake_case
    • Python ignores the distinction

  199. Which statement correctly describes imports and layout?

    • Imports are normally organized near the top and separated into sensible groups.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  200. Do annotations alone enforce parameter types at runtime?

    • Yes
    • No
    • Python ignores the distinction

  201. Which statement correctly describes collection types?

    • Generic annotations describe the element or key and value types inside collections.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  202. What does a loose version constraint guarantee?

    • One exact resolved environment
    • A permitted version range
    • Python ignores the distinction

  203. Which statement correctly describes reproducibility?

    • Record the interpreter, dependency inputs and installation instructions.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  204. Should a project normally commit its .venv directory?

    • Yes
    • No
    • Python ignores the distinction

  205. Which statement correctly describes commits?

    • Focused commits describe one coherent behavior change with a useful message.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  206. Why did editing second also change first?

    • Every list is globally shared
    • Both names reference the same list
    • Python ignores the distinction

  207. Which statement correctly describes problem discussion?

    • Clarify inputs, constraints and expected results before coding.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  208. Does with sqlite3.connect(...) by itself close the connection?

    • Yes
    • No
    • Python ignores the distinction

  209. Which statement correctly describes transactions and closure?

    • Resource closure and transaction handling are related but distinct responsibilities.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  210. Which clause limits rows affected by a simple UPDATE?

    • ORDER BY alone
    • WHERE
    • Python ignores the distinction

  211. Which statement correctly describes value binding?

    • The placeholder syntax belongs to the selected database driver.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  212. How should a member identifier enter a SQL query?

    • By concatenating user text
    • As a bound parameter
    • Python ignores the distinction

  213. Which statement correctly describes parameters?

    • Connector/Python uses parameter placeholders to bind values separately from SQL.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  214. Which update operator changes selected MongoDB fields?

    • Replacing every field manually
    • $set
    • Python ignores the distinction

  215. Which statement correctly describes filters and updates?

    • Query filters select documents while update operators describe requested changes.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  216. Why set a request timeout?

    • To guarantee the server returns valid JSON
    • To bound a wait for network activity
    • Python ignores the distinction

  217. Which statement correctly describes response handling?

    • Status checks and decoding are separate steps.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  218. Can a valid token still lack permission for an operation?

    • No
    • Yes
    • Python ignores the distinction

  219. Which statement correctly describes failure categories?

    • Network failures, error statuses and invalid response data need separate diagnoses.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  220. What type is written to the response body stream?

    • A Python dictionary
    • bytes
    • Python ignores the distinction

  221. Which statement correctly describes encoding?

    • JSON text must be encoded into bytes for a binary response stream.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  222. Should the Flask development debugger be exposed in production?

    • Yes
    • No
    • Python ignores the distinction

  223. Which statement correctly describes request data?

    • JSON and form data arrive through request interfaces and require validation.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  224. What does axis=1 sum in a two dimensional array?

    • Every column into one row
    • Values within each row
    • Python ignores the distinction

  225. Which statement correctly describes axes?

    • Axis arguments select the dimensions along which reductions operate.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  226. Which selector uses integer positions?

    • loc
    • iloc
    • Python ignores the distinction

  227. Which statement correctly describes aggregation?

    • groupby partitions rows into groups before aggregation.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  228. Which object represents an individual plotting area?

    • The filename
    • Axes
    • Python ignores the distinction

  229. Which statement correctly describes labels and scales?

    • Titles, axis labels and appropriate scales help a reader interpret the measurements.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  230. Why retain rejected row information?

    • To increase the reported total
    • To explain cleaning decisions
    • Python ignores the distinction

  231. Which statement correctly describes conversion and provenance?

    • Convert values explicitly and preserve enough information to explain rejected rows.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  232. Which statistic is generally less affected by one extreme duration?

    • Mean
    • Median
    • Python ignores the distinction

  233. Which statement correctly describes sampling?

    • A collected sample may differ from the full process being studied.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  234. Which chart shows the distribution of one numeric variable?

    • Category bar chart
    • Histogram
    • Python ignores the distinction

  235. Which statement correctly describes scatter plots?

    • A scatter plot shows paired numeric observations.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  236. What is the worst case growth of a full list scan?

    • O(1)
    • O(n)
    • Python ignores the distinction

  237. Which statement correctly describes worst and average cases?

    • Different inputs can require different amounts of work.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  238. What prerequisite does binary search require?

    • A random input order
    • A suitably sorted search space
    • Python ignores the distinction

  239. Which statement correctly describes interval invariant?

    • Maintain a search interval that still contains every possible matching position.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  240. What does a stable sort preserve for equal keys?

    • Reverse order
    • Their original relative order
    • Python ignores the distinction

  241. Which statement correctly describes algorithm tradeoffs?

    • Insertion sort illustrates local shifts while merge sort illustrates dividing and combining.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  242. Which order describes a queue?

    • Last in, first out
    • First in, first out
    • Python ignores the distinction

  243. Which statement correctly describes empty structures?

    • Removal from an empty stack or deque needs an explicit policy.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  244. How does a singly linked list reach the next value?

    • By constant time arbitrary indexing
    • By following a next reference
    • Python ignores the distinction

  245. Which statement correctly describes insertion?

    • Insertion can relink a known predecessor without moving a whole array of elements.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  246. Can different dictionary keys have the same hash?

    • No
    • Yes
    • Python ignores the distinction

  247. Which statement correctly describes hashable keys?

    • A key needs a stable hash and a compatible equality contract while stored.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  248. What determines search cost in a simple BST?

    • Only the root value
    • The tree height
    • Python ignores the distinction

  249. Which statement correctly describes traversal?

    • Inorder, preorder and postorder visit the same structure in different sequences.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  250. Which traversal finds shortest hop counts in an unweighted graph?

    • Any depth first traversal
    • Breadth first search
    • Python ignores the distinction

  251. Which statement correctly describes breadth first search?

    • BFS explores by distance in edge count using a queue.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  252. What must mutable backtracking restore?

    • Every global variable
    • The state changed for the current choice
    • Python ignores the distinction

  253. Which statement correctly describes memoization?

    • Caching results can avoid solving an identical subproblem repeatedly.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  254. Why compare a learned model with a baseline?

    • To avoid all evaluation
    • To check whether complexity improves useful performance
    • Python ignores the distinction

  255. Which statement correctly describes baselines?

    • A simple baseline gives a model result a useful comparison.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  256. What does multimode help represent?

    • Only the arithmetic average
    • Ties among most frequent values
    • Python ignores the distinction

  257. Which statement correctly describes standard deviation?

    • Standard deviation expresses spread in the original measurement units.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  258. Why can percentile calculations differ between tools?

    • Percentiles are unrelated to ordering
    • They can use different interpolation conventions
    • Python ignores the distinction

  259. Which statement correctly describes outlier meaning?

    • An unusual observation may be an error or an important real event.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  260. What kind of target does ordinary linear regression predict?

    • Only a category label
    • A numeric value
    • Python ignores the distinction

  261. Which statement correctly describes fitting and residuals?

    • Fitting selects coefficients according to an objective, and residuals compare observed with predicted outcomes.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  262. What does predict_proba provide?

    • Guaranteed outcomes
    • Estimated class probabilities
    • Python ignores the distinction

  263. Which statement correctly describes decision thresholds?

    • A threshold turns a probability into a decision and should reflect the task tradeoffs.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  264. Why scale mixed KNN features?

    • To guarantee perfect accuracy
    • Because distance depends on their magnitudes
    • Python ignores the distinction

  265. Which statement correctly describes hyperparameters?

    • Tree depth and neighbor count are choices selected using training side validation.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  266. Which observations should fit a preprocessing transformation?

    • The full dataset including test observations
    • Training observations
    • Python ignores the distinction

  267. Which statement correctly describes preprocessing?

    • Learn transformations on training observations and apply the learned transformation to held out data.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  268. Why include preprocessing inside the cross validation pipeline?

    • To inspect the final test target
    • To fit it separately on each training fold
    • Python ignores the distinction

  269. Which statement correctly describes metrics?

    • A metric should match the outcome and operational consequences.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  270. Do K-means cluster labels have inherent category meanings?

    • Yes
    • No
    • Python ignores the distinction

  271. Which statement correctly describes scaling and choices?

    • Feature scale, cluster count and initialization affect the result.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  272. What should you identify before adapting an example?

    • Only its line count
    • Its inputs, outputs and assumptions
    • Python ignores the distinction

  273. Which statement correctly describes variation?

    • Changing one meaningful assumption tests whether the underlying idea is understood.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  274. What should a challenge include besides an ordinary example?

    • Only a time limit
    • Boundary and adversarial cases
    • Python ignores the distinction

  275. Which statement correctly describes incremental solutions?

    • A clear working approach can be improved after its behavior is verified.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  276. Why attempt a problem before reading its solution?

    • To guarantee a perfect first answer
    • To expose your current reasoning and gaps
    • Python ignores the distinction

  277. Which statement correctly describes delayed solutions?

    • Attempt the task and record a prediction before comparing a worked solution.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  278. What makes an advanced exercise valuable?

    • Only a larger line count
    • Design and tradeoff decisions with evidence
    • Python ignores the distinction

  279. Which statement correctly describes advanced exercises?

    • Advanced tasks ask for design, testing and performance decisions rather than merely longer syntax.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  280. How should a missed quiz question guide study?

    • Memorize the option position
    • Review its explanation and apply the concept again
    • Python ignores the distinction

  281. Which statement correctly describes error analysis?

    • A wrong answer is useful when its explanation identifies the mistaken rule.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  282. What should the first project milestone provide?

    • Every planned feature at once
    • One small working behavior
    • Python ignores the distinction

  283. Which statement correctly describes milestones?

    • Deliver one working behavior at a time with observable examples.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  284. Which responsibility should be separated from stock arithmetic?

    • The meaning of subtraction
    • External file parsing
    • Python ignores the distinction

  285. Which statement correctly describes testing collaborators?

    • Test pure logic directly and control external file dependencies with temporary data.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  286. Do adjacent half open booking intervals overlap?

    • Yes
    • No
    • Python ignores the distinction

  287. Which statement correctly describes performance evidence?

    • Measure a representative workload before choosing an optimization.
    • Only the example output matters, not the rule
    • Every operation has the same behavior

  288. When should the separate machine learning track be approached?

    • Before variables and collections
    • After the core and relevant data science prerequisites
    • Python ignores the distinction

  289. Which statement correctly describes optional tracks?

    • Database and web, data science, DSA and machine learning are goal dependent branches.
    • Only the example output matters, not the rule
    • Every operation has the same behavior
RelaxedNo clock. Read the explanation after each answer.
Timed30 seconds per question. Great for revision.
Exam modeNo feedback until the end, then a full review.

About the Python quiz

This Python quiz checks the ideas from every lesson in the course, from print() and variables to decorators, regular expressions and testing. Most questions show a few lines of code and ask what they print, because reading code and predicting its output is the single most useful skill when you're learning to program. Others check vocabulary such as "parameter", "immutable" or "exception", which you'll need when reading documentation and error messages.

If you're still in the beginner stage, choose Easy and pick a topic you've just finished, such as strings or loops. Once you've worked through the intermediate lessons, try Mixed with 10 questions: you'll meet lists, dictionaries and functions side by side, just as they appear in real programs. Save Exam mode for when you've finished the course; it hides the answers until the end, so it's an honest check of what you remember.

When you get a question wrong, read the explanation, then open the lesson linked in your results and look at its examples again. Mistakes in Python often come from small details: an index that starts at 0, a method that returns a new string instead of changing the old one, or an indent in the wrong place. Spotting those details in a quiz is exactly what makes them easy to avoid in your own code.

The question bank holds 289 questions drawn from 107 Python lessons: 119 easy, 144 medium and 26 hard. Every time you start, the quiz picks a fresh random selection that matches your settings, so retaking it is a good way to practise. After each answer, or at the end in exam mode, you'll see why the right answer is right, and every question you miss links back to the lesson that teaches it.

What the Python quiz covers

Beginner

  1. 1Python Introduction5 questions
  2. 2Python Syntax and Statements2 questions
  3. 3Python Comments2 questions
  4. 4Python The print() Function2 questions
  5. 5Python Variables and Data Types5 questions
  6. 6Python Naming and Multiple Assignment2 questions
  7. 7Python Numbers and Math5 questions
  8. 8Python Type Casting2 questions
  9. 9Python The None Value2 questions
  10. 10Python Strings5 questions
  11. 11Python String Formatting5 questions
  12. 12Python User Input with input()2 questions
  13. 13Python Boolean Values and Expressions2 questions
  14. 14Python Operators and Precedence2 questions
  15. 15Python if, elif and else5 questions
  16. 16Python The match Statement2 questions
  17. 17Python The pass Statement2 questions
  18. 18Python Loops5 questions
  19. 19Python Lists5 questions

Intermediate

  1. 20Python Dictionaries5 questions
  2. 21Python Tuples and Sets5 questions
  3. 22Python range() in Depth2 questions
  4. 23Python Arrays in Python2 questions
  5. 24Python Advanced Collection Methods2 questions
  6. 25Python Copying and Joining Collections2 questions
  7. 26Python Functions5 questions
  8. 27Python Function Arguments and Scope5 questions
  9. 28Python Recursion2 questions
  10. 29Python List Comprehensions5 questions
  11. 30Python Error Handling5 questions
  12. 31Python File Handling5 questions
  13. 32Python Modules and Packages5 questions
  14. 33Python Dates and Times5 questions

Advanced

  1. 34Python Classes and Objects5 questions
  2. 35Python Inheritance5 questions
  3. 36Python Magic Methods2 questions
  4. 37Python Class Methods and Properties2 questions
  5. 38Python Polymorphism and Inner Classes2 questions
  6. 39Python Type Hints and Dataclasses5 questions
  7. 40Python Iterators and Generators5 questions
  8. 41Python Iterators vs. Iterables2 questions
  9. 42Python Context Managers2 questions
  10. 43Python Decorators5 questions
  11. 44Python Regular Expressions5 questions
  12. 45Testing Python Code5 questions
  13. 46Working with Web APIs in Python5 questions

Files and Standard Library

  1. 47Python Read, Write, Create and Delete Files2 questions
  2. 48Python JSON Handling2 questions
  3. 49Python CSV Handling in Depth2 questions
  4. 50Python File and Directory Operations2 questions
  5. 51Python Built-in Functions Reference2 questions
  6. 52Python String and Collection Methods Reference2 questions
  7. 53Python Exception Types Reference2 questions
  8. 54Python Keywords and Glossary2 questions
  9. 55Python Standard Library Essentials2 questions
  10. 56Python Environment Variables and Configuration2 questions
  11. 57Python pip and Virtual Environments2 questions

Professional Development

  1. 58Python Debugging Python Programs2 questions
  2. 59Python Logging2 questions
  3. 60Python Unit Testing and pytest2 questions
  4. 61Python Mocking and Test Fixtures2 questions
  5. 62Python Code Style and PEP 82 questions
  6. 63Python Type Checking and Type Hinting2 questions
  7. 64Python Virtual Environments and Dependencies2 questions
  8. 65Python Git and Python Projects2 questions
  9. 66Python Interview Questions and Answers2 questions

Database and Web Track

  1. 67Python Database Connections and Queries2 questions
  2. 68Python SQL CRUD with Python2 questions
  3. 69Python MySQL Tutorial2 questions
  4. 70Python MongoDB Tutorial2 questions
  5. 71Python HTTP Requests and REST APIs2 questions
  6. 72Python API Authentication and Errors2 questions
  7. 73Python A Simple Python Web Server2 questions
  8. 74Python Introduction to Flask2 questions

Data Science Track

  1. 75Python NumPy Tutorial2 questions
  2. 76Python Pandas Tutorial2 questions
  3. 77Python Matplotlib Tutorial2 questions
  4. 78Python Data Cleaning and Analysis2 questions
  5. 79Python Statistics with Python2 questions
  6. 80Python Line, Bar, Scatter and Histogram Charts2 questions

DSA Track

  1. 81Python Time and Space Complexity2 questions
  2. 82Python Linear and Binary Search2 questions
  3. 83Python Sorting Algorithms2 questions
  4. 84Python Stacks and Queues2 questions
  5. 85Python Linked Lists2 questions
  6. 86Python Hash Tables2 questions
  7. 87Python Trees and Binary Search Trees2 questions
  8. 88Python Graphs and Graph Traversal2 questions
  9. 89Python Recursive Problem Solving2 questions

Machine Learning Track

  1. 90Python Introduction to Machine Learning2 questions
  2. 91Python Mean, Median, Mode and Deviation2 questions
  3. 92Python Data Distribution and Percentiles2 questions
  4. 93Python Linear and Multiple Regression2 questions
  5. 94Python Logistic Regression2 questions
  6. 95Python Decision Trees and K-Nearest Neighbors2 questions
  7. 96Python Training and Testing Datasets2 questions
  8. 97Python Cross-Validation and Evaluation2 questions
  9. 98Python Clustering and K-Means2 questions

Practice and Projects

  1. 99Python Examples Library2 questions
  2. 100Python Coding Challenges2 questions
  3. 101Python Practice Problems2 questions
  4. 102Python Exercises by Difficulty2 questions
  5. 103Python Quizzes by Chapter2 questions
  6. 104Python Beginner Python Projects2 questions
  7. 105Python Intermediate Python Projects2 questions
  8. 106Python Advanced Python Projects2 questions
  9. 107Python Study Plan and Learning Roadmap2 questions
Esc
↑↓ to navigateEnter to open