Python Syntax

What is Python Syntax?

Python syntax refers to the set of rules that define how a Python program is written and interpreted. Python has clean and readable syntax, which emphasizes indentation over braces or semicolons.

1. Execute Python Syntax

Python syntax can be executed in several ways:

Example 1: Executing Directly in Interactive Mode (REPL)

print("Hello, World!")

Output:

Hello, World!

Example 2: Saving in a .py file

Code (hello.py):

print("Welcome to Python!")

To execute:

python hello.py

Output:

Welcome to Python!

2. Python Indentation

Indentation is mandatory in Python and is used to define blocks of code (like loops, functions, and conditionals). It usually consists of 4 spaces or 1 tab.

Incorrect Indentation (This will raise an error):

if 5 > 2:
print("Five is greater than two!")

Output:

IndentationError: expected an indented block

Correct Indentation:

if 5 > 2:
    print("Five is greater than two!")

Output:

Five is greater than two!

Example: Indentation in a Function

def greet(name):
    print("Hello", name)
    print("Welcome to Python!")

greet("Alice")

Output:

Hello Alice
Welcome to Python!

Example: Indentation in Loops

for i in range(3):
    print("Iteration:", i)
    print("Inside loop")
print("Outside loop")

Output:

Iteration: 0
Inside loop
Iteration: 1
Inside loop
Iteration: 2
Inside loop
Outside loop

Summary of Python Syntax Rules: