Functions in Python: Definition and Uses

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Functions in Python: Definition and Uses

Definition of a Function:

Functions are defined using the def keyword, followed by the function name and parentheses.

Syntax:

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def greet():

    print("Hello, World!")

To call the function:

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greet()

Functions with Parameters:

Functions can accept parameters (inputs) and return values (outputs).

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def add(a, b):

    return a + b

result = add(5, 3)  # returns 8

Types of Functions:

Built-in Functions – Predefined, like len(), max(), print().

User-defined Functions – Created by the programmer.

Lambda Functions – Anonymous, short functions:

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square = lambda x: x * x

print(square(4))  # Output: 16

Uses of Functions:

Modularity: Breaks large code into smaller parts.

Reusability: Write once, use multiple times.

Readability: Makes code easy to understand and debug.

Maintainability: Easier to manage and update code.

Functions are fundamental in Python and essential for writing clean, efficient, and organized code in both small and large applications.

Learn More

Python Conditional Statements Explained

Variables and Data Types in Python

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