In Python, a module is a file containing a collection of functions and variables. This collection can be referenced by other Python programs. Modules are a convenient way to create reusable code to handle commonly performed tasks.

To create a module, all you need to do is create a file containing the functions and variables that you want to include in the module.

For example, suppose that you want to create a module called temperature that contains functions to convert temperature readings in Fahrenheit to Celsius, and vice versa. Here are some sample functions that perform these conversions:

def FtoC(degf):
    degc = (degf - 32) / 1.8
    return degc

def CtoF(degc):
    degf = degc * 1.8 + 32
    return degf		

To create a module named temperature that contains these functions, you need to:

• Save these functions in a file named temperature.py.
• Ensure that Python can successfully search for this module.

Note that the name of the module always matches the name of the file. Modules always have a suffix of .py.

	For information on how to include global variables in functions that are defined in modules, see Global Variables.

The following sections provide more information on modules: