2D lists | Intro to CS - Python | Khan Academy

Channel:
Subscribers:
8,970,000
Published on ● Video Link: https://www.youtube.com/watch?v=ke79Rj7V6sY



Duration: 0:00
2,412 views
52


Nested lists can model game boards, images, matrices, and more! Learn how to access the rows and columns of a 2D list. Use nested for loops to iterate over every element, in order.

View the program used in this video at: https://www.khanacademy.org/python-program/2d-lists/4505398963978240

Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now with our Intro to Computer Science - Python course!

Course link: https://www.khanacademy.org/computing/intro-to-python-fundamentals/x5279a44ae0ab15d6:analyzing-data-with-dictionaries
Course playlist:    • Intro to Computer Science - Python | Khan ...  

Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We offer quizzes, questions, instructional videos, and articles on a range of academic subjects, including math, biology, chemistry, physics, history, economics, finance, grammar, preschool learning, and more. We provide teachers with tools and data so they can help their students develop the skills, habits, and mindsets for success in school and beyond. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan Academy every month. As a 501(c)(3) nonprofit organization, we would love your help!

Donate or volunteer today! Donate here: https://www.khanacademy.org/donate?utm_source=youtube

Volunteer here: https://www.khanacademy.org/contribute?utm_source=youtube

TIMESTAMPS:
00:00 : modeling a tic-tac-toe board
00:31 : accessing a 2D list
01:29 : 2D list use cases
02:08 : pixels
02:35 : iterating over a 2D list
03:10 : tracing nested loops
04:59 : mutating a 2D list
06:03 : rows with different lengths




Other Videos By Khan Academy


18 hours agoMagnetic force | Middle school physics | Khan Academy
1 day ago2D lists | Intro to CS - Python | Khan Academy
1 day agoElectric force | Middle school physics | Khan Academy
2 days agoGravitational force | Middle school physics | Khan Academy
3 days agoNewton's second law | Middle school physics | Khan Academy
4 days agoThermal energy and heat transfer | Middle school chemistry | Khan Academy
5 days agoNewton's first law | Middle school physics | Khan Academy
6 days agoNewton's third law | Middle school physics | Khan Academy
2025-07-05Forces | Middle school physics | Khan Academy
2025-07-04Reference frames | Middle school physics | Khan Academy
2025-07-03Data modeling and APIs | Intro to CS - Python | Khan Academy
2025-07-03Acceleration | Middle school physics | Khan Academy
2025-07-02Solving multi-step problems (division): cookies | Khan Academy
2025-07-02Adding decimals: science experiment | 4th grade math (TX TEKS) | Khan Academy
2025-07-02Solving multi-step problems (division): books | Khan Academy
2025-07-01Representing multi-step problems: equations | 4th grade math (TX TEKS) | Khan Academy
2025-07-01Representing multi-step problems: strip diagrams | 4th grade math (TX TEKS) | Khan Academy
2025-07-01Solving multi-step problems (multiplication): camping items | Khan Academy
2025-07-01Calculating profit with multiplication | 4th grade math (TX TEKS) | Khan Academy
2025-07-01Calculating savings | Personal financial literacy | 4th grade math (TX TEKS) | Khan Academy
2025-07-01Estimating large differences | 4th grade math (TX TEKS) | Khan Academy