Python Cheat Sheet

PrintOutput to console

print("Hello, World!")

VariablesDynamic typing, no declaration needed

name = "Mishu"
age = 25
pi = 3.14

CommentsSingle and multi-line

# This is a comment
"""
Multi-line string
as a comment
"""

InputRead user input

name = input("Enter your name: ")

StringsText data

s = "hello"
s.upper()
s.replace("h", "j")

ListsOrdered, mutable sequence

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

TuplesOrdered, immutable sequence

point = (3, 4)
x, y = point

DictionariesKey-value pairs

d = {"name": "Mishu", "age": 25}
d["name"]
d.get("key", "default")

SetsUnordered unique elements

s = {1, 2, 3}
s.add(4)
{1, 2} | {2, 3}  # union

If-elif-elseConditional execution

if x > 0:
    print("positive")
elif x == 0:
    print("zero")
else:
    print("negative")

For loopIterate over a sequence

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

for k, v in d.items():
    print(k, v)

While loopLoop while condition is true

while x > 0:
    x -= 1

List comprehensionConcise list creation

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

DefineFunction definition using def

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

LambdaAnonymous function

double = lambda x: x * 2
list(map(lambda x: x**2, [1, 2, 3]))

*args, **kwargsVariable arguments

def func(*args, **kwargs):
    print(args, kwargs)