What is a module? why?

A module is a Python file with one or more functions and variables. These functions and variables can be called from your program by importing a module.

Modules can be used to organize your code.

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In this example we use the math module. This module has many functions such as sine, cosine as well as variables:

import math

x = math.sin(1)

Find available functions and variables in a Python module

To find the available functions in a module, you can use this code:

import math

content = dir(math)
A list will be returned with all functions and variables:

python module list all functions

Create your own module

First create a Python file with a function. We call this file hello.py and we have one function:

def hello():
print("Hello World")
Now that we have create a module named hello we can use it in our program test.py
 # Import your module
import hello

# Call of function defined in module