A Practical Introduction to Python Programming by Unknown

Author:Unknown
Language: eng
Format: epub, pdf

Chapter 13

Functions

Functions are useful for breaking up a large program to make it easier to read and maintain. They

are also useful if find yourself writing the same code at several different points in your program.

You can put that code in a function and call the function whenever you want to execute that code.

You can also use functions to create your own utilities, math functions, etc.

13.1

Basics

Functions are defined with the def statement. The statement ends with a colon, and the code that

is part of the function is indented below the def statement. Here we create a simple function that

just prints something.

def print_hello():

print('Hello!')

print_hello()

print('1234567')

print_hello()

Hello!

1234567

Hello!

The first two lines define the function. In the last three lines we call the function twice.

One use for functions is if you are are using the same code over and over again in various parts of

your program, you can make your program shorter and easier to understand by putting the code

in a function. For instance, suppose for some reason you need to print a box of stars like the one

below at several points in your program.

119

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