Useful links

Documentation

Python documentation — official documentation for the language and standard library
The Python Tutorial — the official guide to language fundamentals, from syntax to classes
Python Data Model — special methods, protocols, and Python object behavior
Regular Expression HOWTO — an introduction to regular expressions and the re module
typing — Support for type hints — type hints, generics, and protocols
sqlite3 — DB-API 2.0 interface for SQLite databases — working with SQLite databases using the standard library

SQLAlchemy documentation — object-relational mapping (ORM) and Core for database access
NumPy documentation — multidimensional arrays and vectorized numerical computing
pandas documentation — tabular data, filtering, grouping, and data analysis
Matplotlib documentation — plotting graphs and charts, with a gallery of examples
Qt for Python documentation — widgets, signals and slots, and Model/View architecture in PySide6

PyCharm documentation — reference for the IDE, debugger, and test runner
uv documentation — managing Python versions, virtual environments, and dependencies
pytest documentation — writing unit tests, fixtures, and parametrization
mypy documentation — static type checking using annotations
Ruff documentation — a fast Python linter and code formatter
Python Packaging User Guide — packaging projects, pyproject.toml, and publishing packages
PyInstaller Manual — building an application into an executable for distribution

Real Python — Object-Oriented Programming in Python — a detailed free tutorial on classes, objects, and inheritance
Python Tutor — step-by-step visualization of code execution, variables, and objects in memory