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Python Syntax

Python syntax is simple, clean, and easy to read. Unlike many programming languages, Python relies on indentation and readable structure instead of brackets or semicolons.

Python Indentation

Indentation in Python is mandatory. It defines blocks of code such as loops, conditions, and functions.
If indentation is incorrect, Python raises an error.
Important

Python uses spaces or tabs for indentation, but spaces are recommended.

Code Example 1: Correct Indentation

python
if 10 > 5:
    print("10 is greater than 5")

Code Example 2: Indentation in Loop

python
for i in range(3):
    print(i)
    print("Inside the loop")

Code Example 3: Indentation Error Example

python
if 5 > 2:
print("This will cause an error")

Python Variables

Variables are used to store data values in Python. Python creates variables automatically when you assign a value.
Python variables:
  • Do not need type declaration
  • Can change type dynamically
Key Rule

A variable name must start with a letter or underscore.

Code Example 1: Creating Variables

python
name = "Python"
version = 3

Code Example 2: Dynamic Typing

python
x = 10
x = "Ten"
print(x)

Code Example 3: Multiple Assignments

python
a, b, c = 1, 2, 3
print(a, b, c)

Python Comments

Comments are used to explain code and make it more readable. Python ignores comments during execution.
Python supports:
  • Single-line comments
  • Multi-line comments (using triple quotes)
Best Practice

Write comments to explain why the code exists, not what it does.

Code Example 1: Single-Line Comment

python
# This is a single-line comment
print("Hello Python")

Code Example 2: Inline Comment

python
x = 10  # This stores a number
print(x)

Code Example 3: Multi-Line Comment

python
"""
This is a multi-line comment.
It is used to describe larger sections of code.
"""
print("Python Comments")