Python Functions

Package reusable behavior.

Python

def average(values):
    return sum(values) / len(values)

print(average([82, 91, 76, 95]))

Output

86.0

Explanation

Define a function with def, give it parameters, and return a result. Calling the function runs its body with the supplied arguments.

Explore the dry run

Guided walkthroughReady

1def average(values):

2 return sum(values) / len(values)

4print(average([82, 91, 76, 95]))

Start to inspect the source, values, and output. These prepared steps explain the published sample; grouped loop steps describe multiple iterations.

View the complete dry-run table

Prepared trace of the published program. Some rows group repeated iterations.
What happens	State after step	Output so far
Define average; its body waits until the function is called.	`—`	—
Create the list and call average with it.	`values = [82, 91, 76, 95]`	—
sum is 344 and len is 4; return 344 / 4.	`return = 86.0`	—
Print the returned value.	`return = 86.0`	86.0