How To Write Modules in Python 3

Python is a versatile programming language that supports modular programming. Modules are reusable code blocks that can be imported into other programs. In this tutorial, we will learn how to write modules in Python 3.

Step 1: Creating a Module

To create a module, create a new Python file with a .py extension. For example, create a file named "mymodule.py".

Within the module, you can define functions, classes, and variables. For example, we can define a function that prints "Hello, World!":

def hello():
    print("Hello, World!")

Step 2: Importing a Module

To use a module in another program, we need to import it. We can import a module using the "import" keyword followed by the module name:

import mymodule

Now, we can call the "hello" function from the "mymodule" module:

mymodule.hello()

This will output "Hello, World!" to the console.

Step 3: Using the "from" Keyword

We can also use the "from" keyword to import specific functions or variables from a module:

from mymodule import hello

Now, we can directly call the "hello" function without the module name:

hello()

This will also output "Hello, World!" to the console.

That's it! You now know how to write and use modules in Python 3.

Keywords: Python 3, Modules, Tutorial, creating a module, importing a module, using the from keyword.