Python Cheatsheet: Essential Syntax and Tools

Python is a versatile language used for everything from automation to AI. This cheatsheet gives you a fast overview of essential syntax and tools across all levels.

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📖 Foundation of Python Programming

Basic Commands

• print() – Show output on the screen
• input() – Get user input
• len() – Count items in a structure
• type() – Check variable type
• range() – Generate a sequence of numbers
• help() – Get built-in documentation

Variables and Data Types

• int, float, bool – Numeric and logical values
• str – Text data
• list – Ordered, changeable collection
• tuple – Ordered, unchangeable collection
• dict – Key-value mapping
• set – Unordered, unique values

Control Structures

• if, elif, else – Conditional logic
• for – Iterate over a sequence
• while – Loop based on condition
• break – Stop loop early
• continue – Skip iteration
• pass – Do nothing (placeholder)

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🧑‍💻 Advanced Programming Concepts

Functions

• def – Create a function
• return – Send back a result
• lambda – Short anonymous function

Object-Oriented Programming (OOP)

• class – Define an object template
• self – Reference the current object
• __init__() – Constructor method

Modules and Packages

• import – Load a module
• from ... import – Import specific items

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🛠️ Specialized Techniques & Tools

Exception Handling

• try, except – Catch errors
• finally – Always execute after try
• raise – Create custom exceptions

File Handling

• open() – Access files
• read(), write() – Read or write file content
• close() – Close file connection

Decorators and Generators

• @decorator_name – Modify function behavior
• yield – Return a value from a generator

List Comprehensions

• [x for x in list if condition] – Build lists in one line

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