File I/O in Python
15 questions · 12 min · Medium
Functions & Lambda in Python
Test your knowledge of functions and lambda expressions in Python, including defining functions, parameters, arguments, return values, default arguments, keyword arguments, *args, **kwargs, scope, and lambda functions.
- 15
- Questions
- 12 min
- Time limit
- Medium
- Difficulty
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All 15 questions and answers Spoilers: this shows the questions and answers. Try the quiz first! Open
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1. Which keyword is used to define a function in Python?
- A. def
- B. function
- C. func
- D. define
Show answer
A. def
The def keyword is used to define a function in Python.
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2. Which statement is used to return a value from a Python function?
- A. return
- B. send
- C. output
- D. yield_value
Show answer
A. return
The return statement exits the function and can provide a value to the caller.
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3. What is the correct way to define a function that accepts one parameter?
- A. def greet(name):
- B. function greet(name):
- C. def greet = (name):
- D. create greet(name):
Show answer
A. def greet(name):
Python functions are defined using def followed by the function name and its parameters in parentheses.
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4. What is an argument in Python?
- A. A value passed to a function when it is called
- B. The name of a function
- C. A value returned only by a function
- D. A Python module
Show answer
A. A value passed to a function when it is called
An argument is a value supplied to a function when the function is called.
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5. What is a default parameter value used for?
- A. To provide a value when an argument is not supplied
- B. To prevent a function from being called
- C. To make every parameter required
- D. To automatically delete the parameter
Show answer
A. To provide a value when an argument is not supplied
A default parameter provides a predefined value that is used when the caller does not provide an argument for that parameter.
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6. What does *args allow a Python function to accept?
- A. A variable number of positional arguments
- B. Only one keyword argument
- C. Only string arguments
- D. A variable number of modules
Show answer
A. A variable number of positional arguments
The *args syntax collects additional positional arguments into a tuple.
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7. What does **kwargs allow a Python function to accept?
- A. A variable number of keyword arguments
- B. Only positional arguments
- C. Only integer arguments
- D. A variable number of functions
Show answer
A. A variable number of keyword arguments
The **kwargs syntax collects additional keyword arguments into a dictionary.
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8. What type of object does a lambda expression create in Python?
- A. A function
- B. A class
- C. A module
- D. A list
Show answer
A. A function
A lambda expression creates a function object, typically used for short anonymous functions.
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9. Which syntax correctly defines a lambda function that adds two numbers?
- A. lambda x, y: x + y
- B. lambda(x, y) => x + y
- C. lambda x, y -> x + y
- D. function lambda(x, y): x + y
Show answer
A. lambda x, y: x + y
Python lambda expressions use the lambda keyword, followed by parameters, a colon, and a single expression.
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10. Which statement about Python lambda functions is correct?
- A. A lambda body contains a single expression
- B. A lambda must contain multiple statements
- C. A lambda cannot accept parameters
- D. A lambda can only return strings
Show answer
A. A lambda body contains a single expression
A lambda function consists of a parameter list and a single expression whose result is returned.
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11. What will the following function return when called as add(3, 4)? def add(a, b): return a + b
- A. 7
- B. 34
- C. 12
- D. None
Show answer
A. 7
The function adds the two numeric arguments, so 3 + 4 returns 7.
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12. Which scope is normally used for a variable created inside a Python function?
- A. Local scope
- B. Global scope
- C. Module-only scope
- D. System scope
Show answer
A. Local scope
A variable assigned inside a function is normally local to that function unless declared otherwise.
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13. Which built-in function can be used to call a function with an iterable's elements as positional arguments?
- A. The function can be called using the * unpacking operator
- B. The function must always use **
- C. The function must use unpack()
- D. The function must use spread()
Show answer
A. The function can be called using the * unpacking operator
The * operator can unpack an iterable into positional arguments when calling a function, such as func(*values).
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14. What is the main purpose of using keyword arguments when calling a Python function?
- A. To specify arguments by parameter name
- B. To convert arguments into strings
- C. To prevent the function from returning a value
- D. To make all arguments global
Show answer
A. To specify arguments by parameter name
Keyword arguments allow callers to associate values explicitly with parameter names, such as greet(name="Alex").
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15. Which built-in function is commonly used with a lambda to transform each item in an iterable?
- A. map()
- B. change()
- C. transform()
- D. iterate()
Show answer
A. map()
The map() function applies a function, often a lambda, to each item of an iterable and returns a map iterator.