Python Modules- How to Create, Use and Variables

Modules in Python are simply ".py" files that contain Python code that may be imported into another Python program.

A module may be thought of as a code library or a file containing a group of functions that you want to add to your program.

We may use modules to group together similar functions, classes, or code blocks in the same file. As a result, splitting large Python code blocks into modules comprising up to 300–400 lines of code is regarded as the best practices for building larger Python code blocks for production-level projects in Data Science.

Write the code you want in a file with the extension.py to build a module:

Example:

def greeting(name):

  print("Hello, " + name)

Using the import line, we can now use the module we just created:

Example:

Import the module named my_module, and call the greeting function:

import my_module

my_module.greeting("Wscube")

Output:

The module can include not only functions, but also variables of any type (arrays, dictionaries, objects, and so on):

Example:

Save this code in the file my_module.py

p1 = {

  "name": "John",

  "age": 23,

  "country": "india"

}

Example:

import my_module

a = my_module.p1["age"]

print(a)

Output:

The module file can be named whatever you like, but it must have the.py extension.

If you wish to import a module, you can use the as keyword to create an alias:

Example:

Create an alias for mymodule called mx:

import mymodule as mx

a = mx.person1["age"]

print(a)

Python comes with a number of built-in modules that you can use whenever you want.

C:\Users\My Name>python demo_module3.py

Output:

Example:

Import and use the platform module:

import platform

x = platform.system()

print(x)

Output:

To list all the function names in a module, there is a built-in function. The dir() method is used to:

Example:

import platform

x = dir(platform)

print(x)

Output:

Using the from keyword, you can choose to import only pieces from a module.

Example:

There is only one function and one dictionary in the module named mymodule:

def greeting(name):

print("Hello, " + name)

person1 = {

  "name": "John",

  "age": 36,

  "country": "Norway" }