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Harvard University via YouTube Free video

CS50 Fall 2025 - Lecture 6 - Python (live, unedited)

Overview

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This is CS50, Harvard University's introduction to the intellectual enterprises of computer science and the art of programming.

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TABLE OF CONTENTS

00:17:30 - Python

00:23:22- Speller

00:29:16 - Filter

00:35:23 - Functions

00:56:58 - Data Types

00:58:56 - Calculator

01:07:33 - Conditionals

01:11:03 - Compare

01:21:39 - Object-Oriented Programming

01:27:36 - copy.py

01:31:51 - Loops

01:33:17 - Meow

02:00:46 - Truncation

02:07:10 - Exceptions

02:15:59 - Mario

02:24:33 - Lists

02:28:31 - Dictionaries

02:42:56 - sys

02:48:31 - csv

02:59:26 - pip

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HOW TO SUBSCRIBE

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HOW TO TAKE CS50

edX: https://cs50.edx.org/

Harvard Extension School: https://cs50.harvard.edu/extension

Harvard Summer School: https://cs50.harvard.edu/summer

OpenCourseWare: https://cs50.harvard.edu/x

HOW TO JOIN CS50 COMMUNITIES

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LinkedIn Page: https://www.linkedin.com/school/cs50/

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Quora: https://www.quora.com/topic/CS50

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Twitter Community: https://twitter.com/i/communities/1722308663522594923

YouTube: http://www.youtube.com/cs50

HOW TO FOLLOW DAVID J. MALAN

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GitHub: https://github.com/dmalan

Instagram: https://www.instagram.com/davidjmalan/

LinkedIn: https://www.linkedin.com/in/malan/

Quora: https://www.quora.com/profile/David-J-Malan

Threads: https://www.threads.net/@davidjmalan

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Twitter: https://twitter.com/davidjmalan

***

CS50 SHOP

https://cs50.harvardshop.com/

***

LICENSE

CC BY-NC-SA 4.0

Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License

https://creativecommons.org/licenses/by-nc-sa/4.0/

David J. Malan

https://cs.harvard.edu/malan

malan@harvard.edu

Chapters 20

  1. 00:17:30Python
  2. 00:23:22Speller
  3. 00:29:16Filter
  4. 00:35:23Functions
  5. 00:56:58Data Types
  6. 00:58:56Calculator
  7. 01:07:33Conditionals
  8. 01:11:03Compare
  9. 01:21:39Object-Oriented Programming
  10. 01:27:36copy.py
  11. 01:31:51Loops
  12. 01:33:17Meow
  13. 02:00:46Truncation
  14. 02:07:10Exceptions
  15. 02:15:59Mario
  16. 02:24:33Lists
  17. 02:28:31Dictionaries
  18. 02:42:56sys
  19. 02:48:31csv
  20. 02:59:26pip

Advantages and disadvantages

Advantages

  • One of the best-taught programming courses in the world, by David J. Malan and his team.
  • Problem sets are real projects that stay on your GitHub.
  • Free certificate from CS50 when you finish on cs50.harvard.edu (the edX certificate is paid).
  • Active community on Discord, Reddit and Ed for help at any hour.
  • Free, one long video that covers a topic end to end.
  • Use the chapters to jump to what you need.
  • Taught by Harvard University, one of the strongest names in its field.
  • Completely free.

Disadvantages

  • Problem sets are hard and take far longer than the videos; plan 10–20 hours a week.
  • Lectures are long (about 2 hours each).
  • No exercises or certificate: code along to make it stick.
  • No certificate.
  • No graded assignments or feedback.

Some points apply to every course of this kind; see how we rank.

Free

  • Free: Watch on YouTube, no account needed.
  • Certificate: None. Code or take notes along to make it stick.

Harvard University is in Tier 1: world-leading universities and India's top institutes of our institution ranking (98/100). CS50 and HarvardX are among the best-taught courses anywhere.

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