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Python Cheatsheet

Python syntax and standard library.

Variables & Types

x = 10          # int
y = 3.14        # float
name = "Alice"  # str
is_active = True # bool

str(10)     # "10"
int("10")   # 10
float(10)   # 10.0

nums = [1, 2, 3]
nums.append(4)
nums[0]         # 1
nums[-1]        # 4

user = {"name": "Alice", "age": 25}
user["name"]    # "Alice"
user.get("id")  # None

coords = (10, 20)      # Tuple (immutable)
unique = {1, 2, 2, 3}  # Set: {1, 2, 3}

if x > 0:
    print("Positive")
elif x == 0:
    print("Zero")
else:
    print("Negative")

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

while x > 0:
    x -= 1

def greet(name="World"):
    return f"Hello, {name}!"

add = lambda x, y: x + y

class Person:
    def __init__(self, name):
        self.name = name
        
    def say_hi(self):
        print(f"Hi, I'm {self.name}")

Python is a high-level, versatile programming language known for its readability and extensive standard library.

This cheatsheet covers essential Python syntax, data structures, loops, and functions for quick reference during development.

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