Python module is a file with a .py extension , containing a set of functions that you want to include in your applications. The name of the module will be the name of the Python file . It allows you to logically organize your Python code . Grouping related code into a module makes the code easier to understand and use. definitions from a module can be imported into other modules or into the main module . Modules can be either:

1. User-defined
2. Built in

User-defined Modules

How to create a new Python Module?

To create a new module, create a Python file with a .py extension .

def sum(x,y):
  print("Sum of numbers : ", x+y)

Save above code in a file named "addition.py" .

How to use a Python Module?

Next step is to call the module you just created ("addition.py") in another Python source file, by using the import statement .

import addition
addition.sum(15,12)

When the above code is executed, the following output is produced:

Create an alias for Python module

You can create an alias for your Python module when you import a module , by using the as keyword:

Built-in Modules

Python comes with several built-in modules , which you can import in your Python files whenever you like. For example, Python has a built-in module "math" .