Python Tutor
Visualises Python code execution step-by-step, showing variables, call stacks, and object references — invaluable for understanding how code actually runs
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Codecademy — Learn Python 3
Interactive, browser-based Python 3 course with instant feedback — covers syntax, data structures, functions, and OOP with no setup required
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CS50P — Introduction to Programming with Python
Harvard’s free Python course — rigorous, project-based, and widely regarded as one of the best introductions to programming with Python
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Exercism — Python Track
140+ practice exercises with optional mentor feedback — ideal for solidifying fundamentals through deliberate practice on real coding challenges
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