Welcome An introduction to programming using a language called Python. Learn how to read and write code as well as how to test and “debug” it. Designed for students with or without prior programming …

This course is designed for students with or without prior programming experience who’d like to learn Python specifically. Learn about functions, arguments, and return values (oh my!); variables and …

This course teaches you how to solve problems, both with and without code, with an emphasis on correctness, design, and style. Topics include computational thinking, abstraction, algorithms, data …

packages with index.py File I/O os csv Regular Expressions re Classes classes, objects/instances, methods class inheritance, multiple inheritance properties decorators Conclusion [Notes to Self] …

This course explores the concepts and algorithms at the foundation of modern artificial intelligence, diving into the ideas that give rise to technologies like game-playing engines, handwriting …

This is Spring 2025 of CS50 at Harvard College. Looking for Fall 2025? This was CS50 Harvard College Spring 2025

Interested in a verified certificate or a professional certificate? CS50’s Introduction to Programming with Python OpenCourseWare Donate David J. Malan

This course picks up where CS50x leaves off, diving more deeply into the design and implementation of web apps with Python, JavaScript, and SQL using frameworks like Django, React, and Bootstrap.

Feb 4, 2026 · While our courses at Harvard College and Harvard Extension often have final tests, this course does not. You need only complete the assignments listed in each week or module of the course.

If you submit and receive a score of at least 70% on each of this course’s problems as well as its final project, you will be eligible for a free CS50 Certificate like the below.