What are Modules in Python and How to Define Modules in Python with Real Project
Notes Prepared by Pycent.com
Modules in Python
A module in Python is a file containing Python definitions and statements. The file name is the module name with the suffix .py added. Within a module, the module’s name is available as the value of the global variable __name__.
Why Use Modules?
Reusability: Modules allow you to write code once and reuse it across different programs.
Namespace Separation: By organizing code into different modules, you avoid potential naming conflicts between functions, classes, and variables.
Maintainability: It's easier to maintain and update smaller, modularized files than a single large codebase.
How to create a Module:
Example:
math_operations.py
def add(x, y):
return x + y
def subtract(x, y):
return x - y
How to import a Module:
Example:
import math_operations
result = math_operations.add(5, 3)
print(result) # Outputs: 8
How to import Specific Functions
Example:
from math_operations import add
print(add(5, 3)) # Outputs: 8
How to import all functions:
from math_operations import *
print(subtract(5, 3)) # Outputs: 2
Things to Remember:
Avoid using from module_name import * as it might cause unexpected behavior due to naming conflicts.
When creating your modules, organize related functions and classes together for clarity and ease of maintenance.
Remember that any file with a .py extension can act as a module, but not every module is suitable for every application. Design your modules with reuse and clarity in mind.
With these notes, you should have a good foundational understanding of modules in Python and how to leverage them in your programs.
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