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Python Cheat Sheet

This Python cheat sheet provides a concise overview of basic syntax, data types, control structures, functions, collections, and file I/O. It also covers advanced topics like generators and decorators, as well as common built-in functions and package management. Additionally, it lists useful libraries for various purposes such as HTTP requests, data analysis, and web development.

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bhumishvarshney4
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1 views4 pages

Python Cheat Sheet

This Python cheat sheet provides a concise overview of basic syntax, data types, control structures, functions, collections, and file I/O. It also covers advanced topics like generators and decorators, as well as common built-in functions and package management. Additionally, it lists useful libraries for various purposes such as HTTP requests, data analysis, and web development.

Uploaded by

bhumishvarshney4
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Python Cheat Sheet

BASIC SYNTAX

# Comments
# This is a comment
''' Multi-line
comment '''
# Variables
x = 10
name = "Alice"
pi = 3.14
is_valid = True

DATA TYPES

int # 1, 100, -34


float # 3.14, -0.5
str # 'hello', "world"
bool # True, False
list # [1, 2, 3]
tuple # (1, 2, 3)
set # {1, 2, 3}
dict # {'a': 1, 'b': 2}

CONTROL STRUCTURES

# If-else
if x > 0:
print("Positive")
elif x < 0:
print("Negative")
else:
print("Zero")

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

while x < 10:


x += 1

# Loop control
break # exit loop
continue # skip to next iteration

FUNCTIONS
Python Cheat Sheet

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

# Lambda
square = lambda x: x ** 2

COLLECTIONS

# Lists
fruits = ['apple', 'banana']
fruits.append('orange')
fruits[0] # 'apple'

# Tuples
point = (10, 20)
x, y = point

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

# Dictionaries
person = {'name': 'Bob', 'age': 25}
person['name'] # 'Bob'

RANDOM & MATH

import math
math.sqrt(16)
math.pi

import random
random.randint(1, 10)
random.choice([1, 2, 3])

STRINGS

s = "hello"
s.upper() # "HELLO"
s.lower() # "hello"
s.strip() # remove spaces
s.split(",") # split string
s.replace("h", "y")
len(s)

FILE I/O
Python Cheat Sheet

# Write
with open("file.txt", "w") as f:
f.write("Hello")

# Read
with open("file.txt", "r") as f:
data = f.read()

CLASSES & OBJECTS

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

def bark(self):
print("Woof!")

d = Dog("Max")
d.bark()

EXCEPTION HANDLING

try:
x = 1 / 0
except ZeroDivisionError:
print("Cannot divide by zero")
finally:
print("Done")

LIST COMPREHENSION

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

MODULES

import math
from datetime import datetime

ASSERTIONS & TESTING

assert 2 + 2 == 4

ADVANCED TOPICS
Python Cheat Sheet

# Generators
def gen():
yield 1
yield 2

# Decorators
def decorator(func):
def wrapper():
print("Before")
func()
print("After")
return wrapper

@decorator
def say_hello():
print("Hello")

COMMON BUILT-IN FUNCTIONS

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


str(), int(), float(), list(), set(), dict()
sum(), min(), max(), sorted(), zip(), map(), filter()

VIRTUAL ENV & PACKAGE MANAGEMENT

python -m venv env


source env/bin/activate # Linux/macOS
env\Scripts\activate # Windows

pip install requests


pip list

USEFUL LIBRARIES

| Purpose | Library |
|---------------|----------------|
| HTTP Requests | requests |
| Data Analysis | pandas |
| Plotting | matplotlib |
| ML/AI | scikit-learn, tensorflow, transformers |
| Web Dev | flask, django |
| GUI Apps | tkinter, PyQt5 |

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