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id python-syntax
title Python Syntax
sidebar_label Python Syntax
sidebar_position 2
tags
Python
Introduction of python
Python Syntax

Python Syntax

Python is known for its clean and readable syntax. It emphasizes code readability and allows developers to write fewer lines of code compared to other programming languages.

Basic Syntax Structure

Python uses indentation instead of curly braces {} to define blocks of code.

Example:

if 5 > 2:
    print("Five is greater than two!")
  • Indentation is crucial in Python. Missing or incorrect indentation will raise an error.

Comments

Single-line comment:

# This is a comment
print("Hello, World!")

Multi-line comment (using triple quotes):

"""
This is a
multi-line comment
"""
print("Hello again!")

Variables

Python does not require you to declare the type of a variable.

x = 10         # integer
y = "Hello"    # string
z = 3.14       # float

Multiple assignment:

a, b, c = 1, 2, 3

Data Types

Some common data types in Python:

  • int: Integer
  • float: Floating point
  • str: String
  • bool: Boolean
  • list: List of items
  • tuple: Immutable list
  • dict: Key-value pair
  • set: Unique unordered collection
num = 10                 # int
name = "Alice"           # str
items = [1, 2, 3]        # list
person = {"name": "Bob", "age": 25}  # dict

Conditionals

age = 18

if age >= 18:
    print("Adult")
elif age > 12:
    print("Teenager")
else:
    print("Child")

Loops

for loop:

for i in range(5):
    print(i)

while loop:

count = 0
while count < 5:
    print(count)
    count += 1

Functions

Functions are defined using the def keyword.

def greet(name):
    print("Hello, " + name)

greet("Alice")

Return statement:

def add(a, b):
    return a + b

result = add(2, 3)
print(result)  # Output: 5

Modules and Imports

You can import built-in or custom modules.

import math

print(math.sqrt(16))  # Output: 4.0

Operators

Arithmetic Operators:

+  -  *  /  //  %  **

Comparison Operators:

==  !=  >  <  >=  <=

Logical Operators:

and  or  not

Indentation Rules

Python uses 4 spaces (by convention) for indentation. Do not mix tabs and spaces.

Incorrect:

if True:
print("Hello")  # IndentationError

Correct:

if True:
    print("Hello")

Conclusion

Python syntax is simple, readable, and beginner-friendly. With its use of indentation and minimalistic style, it allows you to focus on solving problems rather than worrying about complex syntax rules.

📌 Note: Make sure your Python files have the .py extension and you're using Python 3.x version for compatibility with modern features.