Note 06: Functions

Functions package a useful task behind a name. They make programs easier to test, reuse, and explain.

def square(number):
    return number * number

answer = square(7)
print(answer)

Vocabulary

• Parameter: the variable named in a function definition.
• Argument: the value supplied during a call.
• Return value: the result sent back to the caller.

Design Tip

A good beginner function usually does one clear job. If its description needs the word "and" several times, consider splitting it.