Python

 Python Cheat Sheet

Here's a cheat sheet summarizing some of the common concepts, functions, and syntax of the Python programming language:

python

# Python Cheat Sheet

# Hello World
print("Hello, World!")

# Variables
variable_name = value   # Declare and initialize a variable

# Data Types
string = "Hello"       # String
number = 10            # Integer
float_number = 3.14    # Float
boolean = True         # Boolean
list = [1, 2, 3]       # List
dictionary = {"key": "value"}   # Dictionary
tuple = (1, 2, 3)      # Tuple
set = {1, 2, 3}        # Set

# Operators
+  -  *  /  %     # Addition, Subtraction, Multiplication, Division, Modulus
==  !=  >  <  >=  <=   # Comparison
and  or  not     # Logical

# Control Flow
if condition:
    # Code executed if condition is true
elif condition2:
    # Code executed if condition2 is true
else:
    # Code executed if no previous conditions are true

for item in iterable:
    # Code executed for each item in the iterable

while condition:
    # Code executed repeatedly while condition is true

# Functions
def function_name(parameter1, parameter2):
    # Code executed by the function
    return value   # Optional return statement

# Modules
import module_name   # Import entire module
from module_name import function_name   # Import specific function from a module
from module_name import *   # Import all functions from a module

# File I/O
file = open("filename", "r")   # Open file for reading
content = file.read()          # Read file content
file.close()                   # Close the file

file = open("filename", "w")   # Open file for writing
file.write("Content")          # Write content to the file
file.close()                   # Close the file

# Exception Handling
try:
    # Code that may raise an exception
except ExceptionType as e:
    # Code to handle the exception

# Classes and Objects
class ClassName:
    def __init__(self, parameter1, parameter2):
        self.parameter1 = parameter1
        self.parameter2 = parameter2

    def method_name(self):
        # Code executed by the method

object_name = ClassName(parameter1, parameter2)   # Create an object
object_name.method_name()   # Access object's methods

# List Comprehension
new_list = [expression for item in iterable if condition]

# Lambda Functions
lambda_function = lambda parameter: expression

# Virtual Environment (venv)
# Create virtual environment
python3 -m venv env

# Activate virtual environment
source env/bin/activate

# Deactivate virtual environment
deactivate

# PIP (Python Package Installer)
pip install package_name   # Install a package
pip uninstall package_name   # Uninstall a package
pip freeze   # Show installed packages

# Built-in Functions
print()   # Output to console
len()     # Length of a string, list, etc.
input()   # User input

# Python Standard Library
import math    # Mathematical functions
import random  # Random number generation
import datetime   # Date and time functions
import os        # Operating system interface
import json      # JSON manipulation

# Python Documentation
# Official documentation: https://docs.python.org/3/

This cheat sheet covers some of the commonly used concepts, functions, and syntax of the Python programming language. It serves as a handy reference for quick look-ups and reminders while programming in Python.