Python Modules | Import Custom and Builtin

Python Modules is a separate program that has its own functions and code. We can say the module is the same as a code library that contains a set of functions, if you want, you can use it in your application.

Here is Import a Module lesson, and more.

The Advantage of use Python Modules is

• It’s broken down large programs into small manageable and organized files.
• Modules provide the reusability of code.
• Using an inbuilt or third-party module(library) can reduce time and effort.

Create a Python Modules

You just need to save the code in python file (extension .py), it will be a module.

Module file named mymodule.py, This is a custom module example.

def message(msg):
    print("Module print, " + msg)

How to import modules in Python?

By using the import statement, you can use the module mymodule.py , like this example.

In Hello.py import the module and passing the value to “message” function of “mymodule“.

import mymodule

mymodule.message("Hello")

Output: Module print, Hello

Variables in Module

All type of variables like lists, dictionaries, objects etc can define in module and access form other python class.

Example :

Module file mymoduel.py with a list variable

varList = ['a', 1, 'b', 2]

importing file in Hello.py print(), accessing list variable and in the console.

import mymodule

print(mymodule.varList)

Output : [‘a’, 1, ‘b’, 2]

Import Standard Modules of Python 

Import is searched for the module initially in the local scope by calling __import__() function.

math module is a standard module of python.

import math
print(math.factorial(5))

Output: 120

For a complete tutorial with example follow the “How Python Import-Module“.

Bonus: Also read: the example of File handling in python: Delete File, used an import the OS module to delete a file in python.

Note : This example (Project) is developed in PyCharm 2018.2 (Community Edition)
JRE: 1.8.0
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
macOS 10.13.6

Python 3.7

All Python Modules Example are in Python 3, so it may change its different from python 2 or upgraded versions.