Python Functions, Lambda Expressions, and Scope Essentials — Questions & Answers

This quiz contains 15 questions. Below is a complete reference of all questions, answer choices, and correct answers. You can use this section to review after taking the interactive quiz above.

1. Question 1: Function Definition Syntax

   Which keyword is used to define a regular function in Python?

   • fun
   • def
   • lambda
   • define
   • function
   Show correct answer

   Correct answer: def

2. Question 2: Lambda Syntax

   What is the correct way to write a lambda function that adds 1 to its input x?

   • def lambda x: x + 1
   • lambda x = x + 1
   • lambda x: x + 1
   • add(x): return x + 1
   • x -> x + 1
   Show correct answer

   Correct answer: lambda x: x + 1

3. Question 3: Positional Arguments

   Given def greet(name):, which call provides a valid positional argument?

   • greet(name='Alex', 'Smith')
   • greet:[Alex]
   • greet('Alex')
   • greet()
   • greet name='Alex'
   Show correct answer

   Correct answer: greet('Alex')

4. Question 4: Default Parameters

   What will be printed by def foo(x=3): print(x) when called as foo()?

   • Error
   • x
   • 3
   • foo
   • None
   Show correct answer

   Correct answer: 3

5. Question 5: Return Statement

   Which statement correctly returns the product of two numbers a and b?

   • return a * b
   • return: a * b
   • send a * b
   • yield a * b
   • output a * b
   Show correct answer

   Correct answer: return a * b

6. Question 6: Multiple Return Values

   If a function returns x, y as return x, y, what does the caller receive?

   • Two separate variables without tuple
   • A tuple containing x and y
   • None
   • A single number
   • An array of x and y
   Show correct answer

   Correct answer: A tuple containing x and y

7. Question 7: Calling Lambda Functions

   How do you call a lambda assigned to f for input 5 (f = lambda n: n * n)?

   • call f(5)
   • invoke f 5
   • f.call(5)
   • lambda f(5)
   • f(5)
   Show correct answer

   Correct answer: f(5)

8. Question 8: LEGB Rule

   Which describes the LEGB rule for variable scope in Python?

   • Local, Enclosed, Global, Built-in
   • Local, Extend, Global, Built-in
   • Local, Edge, General, Built-in
   • List, Extern, Global, Base
   • Lambda, External, Global, Base
   Show correct answer

   Correct answer: Local, Enclosed, Global, Built-in

9. Question 9: Global Variable Access

   How do you access a global variable inside a function if a variable with the same name exists locally?

   • Use the local variable by default
   • You cannot access it
   • Declare global variable using global keyword
   • Use extern variable
   • Use it without declaration
   Show correct answer

   Correct answer: Declare global variable using global keyword

10. Question 10: Keyword Arguments

    Which call correctly uses keyword arguments for def add(x, y=2)?

    • add(=x3, =y5)
    • add(x:3, y:5)
    • add(y=5, x=3)
    • add(3 5)
    • add[x=3, y=5]
    Show correct answer

    Correct answer: add(y=5, x=3)

11. Question 11: Variable Number of Arguments

    Which syntax allows a function to accept any number of positional arguments?

    • def func(varargs):
    • def func(*args):
    • def func(...args):
    • def func(args[])
    • def func(args*):
    Show correct answer

    Correct answer: def func(*args):

12. Question 12: Function Documentation

    What string immediately after a function definition can describe its purpose?

    • Label
    • Commentstring
    • Docstring
    • Refstring
    • Funcdesc
    Show correct answer

    Correct answer: Docstring

13. Question 13: Anonymous Functions

    Which statement about lambda functions is true?

    • They must return None
    • They are slower than def functions
    • They have a name
    • They use the def keyword
    • They can only have one expression
    Show correct answer

    Correct answer: They can only have one expression

14. Question 14: Function Scope Example

    Given x = 10; def foo(): x = 5; print(x), what prints when foo() is called?

    • 10
    • 15
    • Error
    • None
    • 5
    Show correct answer

    Correct answer: 5

15. Question 15: Passing Functions as Arguments

    Which is a correct way to pass a function named bar as an argument?

    • func[bar]
    • func->bar
    • func = bar
    • func(bar)
    • func(bar())
    Show correct answer

    Correct answer: func(bar)