Lambda vs regular functions in Python - Quick Revision & Key Differences

Recall & Review

beginner

What is a lambda function in Python?

A lambda function is a small anonymous function defined with the lambda keyword. It can have any number of arguments but only one expression, which is returned automatically.

beginner

How does a regular function differ from a lambda function?

A regular function is defined using def and can have multiple expressions and statements. It can also have a name and more complex logic, while a lambda is anonymous and limited to a single expression.

beginner

Can lambda functions have multiple statements?

No, lambda functions can only contain a single expression. They cannot have multiple statements or commands like regular functions.

intermediate

When should you use a lambda function instead of a regular function?

Use lambda functions for short, simple operations that are used temporarily, such as in sorting or filtering. For more complex logic or reusable code, use regular functions.

beginner

Example: Write a lambda function that adds 5 to a number.

add_five = lambda x: x + 5
This function takes one argument x and returns x + 5.

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

A function

B def

C lambda

D func

Lambda functions are defined using the lambda keyword.

What is the main limitation of lambda functions compared to regular functions?

A They cannot return a value

B They cannot take arguments

C They must have a name

D They can only have one expression

Lambda functions are limited to a single expression and cannot contain multiple statements.

Which of these is a valid lambda function that doubles a number?

A def double(x): return x * 2

B lambda x: x * 2

C lambda x: return x * 2

D def double = lambda x: x * 2

Option B is the correct syntax for a lambda function doubling a number.

When is it better to use a regular function instead of a lambda?

A When the function needs multiple statements

B When the function is very short

C When the function is anonymous

D When the function has only one expression

Regular functions are better for multiple statements or complex logic.

What does this lambda function do? lambda x, y: x + y

A Adds two numbers

B Subtracts y from x

C Multiplies two numbers

D Divides x by y

This lambda function takes two arguments and returns their sum.

Explain the differences between lambda functions and regular functions in Python.

Think about how you write each and when you use them.

Write a simple example of a lambda function and a regular function that both add 10 to a number.

Use lambda x: x + 10 and def add_ten(x): return x + 10