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Nivesh Bansal
Nivesh Bansal

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Python Cheat Sheet for Beginners (2025 Edition)

#python #beginners #programming #cheatsheet

✨ Whether you're just starting your Python journey or need a quick refresher, this cheat sheet is your go-to guide in 2025. Clear, simple, and beginner-friendly!

🧠 1. Basic Python Syntax

➤ Printing Something

print("Hello, World!")
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➤ Comments

# This is a single-line comment """ This is a multi-line comment """
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🔤 2. Variables & Data Types

➤ Variable Assignment

name = "Alice" # string age = 25 # integer height = 5.8 # float is_student = True # boolean
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➤ Type Checking

print(type(name)) # <class 'str'>
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🔁 3. Conditionals 

if age >= 18: print("Adult") elif age >= 13: print("Teen") else: print("Child")
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🔄 4. Loops

➤ For Loop

for i in range(5): print(i) # 0 to 4
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➤ While Loop

count = 0 while count < 5: print(count) count += 1
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📦 5. Data Structures

➤ List

fruits = ["apple", "banana", "cherry"] fruits.append("mango") print(fruits[1]) # banana
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➤ Tuple (Immutable)

point = (3, 4)
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➤ Set (No duplicates)

unique_nums = {1, 2, 3, 2}
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➤ Dictionary (Key-Value)

person = {"name": "Alice", "age": 25} print(person["name"])
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🧮 6. Functions

➤ Defining & Calling Functions

def greet(name): print("Hello, " + name) greet("Nivesh")
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🛠️ 7. File Handling

➤ Writing to a File

with open("example.txt", "w") as file: file.write("Hello File!")
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➤ Reading from a File

with open("example.txt", "r") as file: print(file.read())
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🧰 8. Useful Built-In Functions 

len("hello") # 5 max([1, 5, 3]) # 5 min([1, 5, 3]) # 1 sorted([3, 1, 2]) # [1, 2, 3] sum([1, 2, 3]) # 6
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⚙️ 9. Error Handling 

try: x = 5 / 0 except ZeroDivisionError: print("You can't divide by zero!")
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🧠 10. Object-Oriented Programming (Basics) 

class Person: def __init__(self, name): self.name = name def greet(self): print("Hi, I'm " + self.name) p = Person("Krishna") p.greet()
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📌 Bonus: Python Shortcuts and Tricks 

# Swap values a, b = 5, 10 a, b = b, a # One-line if status = "Pass" if score >= 50 else "Fail" # List comprehension squares = [i**2 for i in range(5)]
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