Course Content

Python Functions Tutorial

1. What is a Function in Python?

What Is Function?Challenge: Building Functions Arguments Return Value Function Body Built-in Functions

2. Positional and Optional Arguments

Positional Arguments Challenge: Positional Arguments Optional Arguments Challenge: Optional Arguments

3. Arbitrary Arguments

Arbitrary Arguments Arbitrary Keyword Arguments Combination of Positional and Optional Arguments

4. Function Return Value Specification

Single Return Value Multiple Return Values None Return Value Generator Functions Challenge: Automated Bus Announcements

5. Recursion and Lambda Functions

Recursion Challenge: Recursive File Search Lambda Functions Immediately Invoked Lambda Expression Writing Effective and Maintainable Functions

Single Return Value

A single return value of a function in Python refers to returning a single object or value from a function. This type of return value has been used in previous sections.


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def add_numbers(a, b):
    return a + b

result = add_numbers(3, 5)
print(result)  # outputs: 8

The function add_numbers takes two arguments, adds them, and returns a single value — their sum. In this example, the result is stored in the variable result and printed to the console.

Note

The join() function in Python is used to join the elements of an iterable, such as a list, into a single string. Learn more about the join function here.

Task

Swipe to start coding

Imagine your friends have each made a shopping list for you. To make things easier, you need to combine all the lists into one.

Initialize the variable merged_list as an empty string to store the final result.
Iterate through each shopping list in the shopping_lists argument using a loop.
Combine the elements of the list into a single string using join() with the separator, a comma and a space (', ').
Add a comma and a space after the merged string to separate lists.
Use the strip() method to remove the trailing comma and return the final shopping list.

Solution

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Section 4. Chapter 1

Single Return Value

A single return value of a function in Python refers to returning a single object or value from a function. This type of return value has been used in previous sections.


              12345
            
def add_numbers(a, b):
    return a + b

result = add_numbers(3, 5)
print(result)  # outputs: 8

The function add_numbers takes two arguments, adds them, and returns a single value — their sum. In this example, the result is stored in the variable result and printed to the console.

Note

The join() function in Python is used to join the elements of an iterable, such as a list, into a single string. Learn more about the join function here.

Task

Swipe to start coding

Imagine your friends have each made a shopping list for you. To make things easier, you need to combine all the lists into one.

Initialize the variable merged_list as an empty string to store the final result.
Iterate through each shopping list in the shopping_lists argument using a loop.
Combine the elements of the list into a single string using join() with the separator, a comma and a space (', ').
Add a comma and a space after the merged string to separate lists.
Use the strip() method to remove the trailing comma and return the final shopping list.

Solution

Switch to desktop for real-world practiceContinue from where you are using one of the options below

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 1

Switch to desktop for real-world practiceContinue from where you are using one of the options below