Python Learning Folder

A 21-topic Python curriculum. Each topic is a numbered folder, and inside each topic the work is split into numbered subfolders, each holding a small runnable example.

Start from 01_setup_and_basics and move down in order.

Folder Structure

python/
├── .gitignore
├── README.md
├── example.txt
├── 01_setup_and_basics/
├── 02_variables_and_data_types/
│   ├── 01_variables_and_data_types/
│   ├── 02_type_conversion/
│   └── 03_multiple_assignment_and_constants/
├── 03_operators_and_expressions/
│   ├── 01_arithmetic_operators/
│   ├── 02_comparison_operators/
│   ├── 03_logical_operators/
│   └── 04_assignment_operators/
├── 04_conditions/
├── 05_loops/
├── 06_functions/
├── 07_data_structures/
├── 08_strings/
├── 09_modules_and_packages/
│   ├── 01_imports/
│   ├── 02_creating_modules/
│   ├── 03_packages/
│   └── 04_project_structure/
├── 10_file_handling/
├── 11_errors_and_exceptions/
├── 12_oop/
├── 13_comprehensions_iterators_generators/
├── 14_decorators_context_managers/
├── 15_testing_debugging_logging/   # has requirements.txt
├── 16_standard_library/
├── 17_environment_and_packages/
├── 18_async_and_concurrency/       # has requirements.txt
├── 19_databases/                   # has requirements.txt
├── 20_web_and_api/                 # has requirements.txt
└── 21_projects_and_practice/       # has requirements.txt

Learning Order

1. 01_setup_and_basics — install Python, run scripts, syntax, comments, input/output
2. 02_variables_and_data_types — variables, numbers, strings, booleans, type conversion, constants
3. 03_operators_and_expressions — arithmetic, comparison, logical, assignment operators
4. 04_conditions — if, elif, else, nested conditions, logical decisions
5. 05_loops — for, while, nested loops, break, continue, pass
6. 06_functions — defining functions, arguments, return values, scope, recursion, lambda
7. 07_data_structures — lists, tuples, sets, dictionaries, nested structures, common methods
8. 08_strings — string basics, slicing, methods, formatting
9. 09_modules_and_packages — import, custom modules, __init__.py, project structure
10. 10_file_handling — reading files, writing files, CSV, JSON
11. 11_errors_and_exceptions — try, except, custom errors, finally, assert
12. 12_oop — classes, objects, methods, inheritance, polymorphism, encapsulation, magic methods
13. 13_comprehensions_iterators_generators — comprehensions, iterators, generators
14. 14_decorators_context_managers — decorators and context managers
15. 15_testing_debugging_logging — pytest, debugging, logging
16. 16_standard_library — os, pathlib, datetime, random, math
17. 17_environment_and_packages — virtual environments, pip, requirements files, package management
18. 18_async_and_concurrency — asyncio, threads, processes
19. 19_databases — SQL basics, SQLite, ORMs
20. 20_web_and_api — HTTP basics, requests, REST, JSON, Flask/FastAPI
21. 21_projects_and_practice — beginner, intermediate, advanced projects, challenges

Every topic folder has its own README.md with subfolder descriptions and the recommended run order.

Setup

Requires Python 3.10 or newer. The first topics use only the standard library — no install needed. From topic 15 onwards some examples need third-party packages.

# 1. (Recommended) Create a virtual environment
python3 -m venv .venv
source .venv/bin/activate          # macOS / Linux
# .venv\Scripts\activate           # Windows

# 2. Install dependencies for the topic you're on
cd 15_testing_debugging_logging && pip install -r requirements.txt && cd ..
cd 20_web_and_api               && pip install -r requirements.txt && cd ..

requirements.txt files live next to the topics that need them (15, 18, 19, 20, 21).

How To Use

• Open the topic's README.md and follow the subfolder order it suggests.

• Run a single example: python3 path/to/folder/app.py

• Run every example in a topic (zsh/bash):

  for d in NN_topic/0?_*; do python3 "$d/app.py"; done

• Keep one concept per file when you add new examples.

• Add more numbered folders later if you want to split a topic further.

Conventions

• Topic and subfolder names use snake_case.
• Topic folders are numbered 01_ … 21_ and are walked in that order.
• Subfolders inside a topic are numbered 01_, 02_, … and walked in that order.
• Every script is named app.py so a topic can be walked with a single for loop.
• Every runnable example is executable as python3 app.py from its own folder.