Ultimate Python Cheatsheet for Beginners

Whether you’re just starting out or brushing up on your coding fundamentals, this Python cheatsheet is your go-to reference for everything essential.

From variables and loops to OOP and file handling, we’ve compiled the most common tools and commands used in Python development.

Let’s dive in 👇

print(), input(), len(), type(), range(), help()

Basic data types:

• int, float, bool, str, list, dict, tuple, set

Control structures:

• if, elif, else
• for, while, break, continue, pass

⚙️ Functions

Define reusable code blocks:

def greet(name):
    return "Hello " + name

Lambda functions (anonymous):

lambda x: x + 1

🧱 OOP (Object-Oriented Programming)

class Person:
    def __init__(self, name):
        self.name = name

Use self, __init__, and class for structured object design.

📦 Modules & Imports

import math
from datetime import datetime

Use external or built-in libraries to extend functionality.

🔐 Exception Handling

try:
    result = 10 / 0
except ZeroDivisionError:
    print("You can't divide by zero!")
finally:
    print("Done.")

📂 File I/O

with open('data.txt', 'r') as f:
    print(f.read())

Use open(), read(), write(), with to handle files safely.

📌 List Comprehensions

squares = [x**2 for x in range(10) if x % 2 == 0]

✨ Decorators (Advanced Beginner)

def decorator(func):
    def wrapper():
        print("Before function")
        func()
    return wrapper

📘 Final Tips

✅ Practice using Replit, Google Colab, or your local terminal
✅ Save this cheatsheet and revisit as you build projects
✅ Don’t memorize — understand through doing

🎓 Recommended Python Courses

Start learning Python with structured video lessons:

🔗 Meta Data Analyst Professional Certificate
🔗 Microsoft Python Development Certificate
🔗 Google IT Automation with Python

📘 Visit programmingvalley.com for more free Python guides, infographics, and learning roadmaps.