Videos
Python for AP CS Principles
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14 video lessons
2:14
What computing is
Almost every program ever written is built from only three ideas, and all three turn up in this lesson. …
2:30
Bits and binary
A photograph, a song and this sentence are all the same thing to a computer, and it is a far simpler thi…
1:44
Data compression
Data costs space to store and time to send, so we compress it — and there are two kinds. Lossless makes …
2:16
Variables and expressions
The equals sign is about to mean something it has never meant in a maths lesson. A variable stores a val…
2:08
Lists and data abstraction
A program often needs many values at once — a whole class of scores. One variable per value gets messy f…
2:15
Selection
A program that cannot choose can only ever do one thing, and there is a limit to how useful that is. Sel…
2:19
Iteration
Writing a line out a hundred times is not the alternative to a loop. Nobody would; the program simply wo…
1:55
Procedures and abstraction
The same eight lines turn up in four places, and then the requirement changes. A procedure is a named bl…
2:15
Algorithms: searching
There are two ways to find something in a list, and the difference between them is the difference betwee…
2:02
Randomness and simulation
Some programs need chance — games, experiments, models of the real world. The random tools live in a mod…
1:55
Algorithmic efficiency
Two programs can both be correct and still take wildly different amounts of time, so we need a way to co…
2:21
The Internet and how data travels
Nobody runs the Internet. It is worth sitting with how strange that is before looking at how it works. T…
2:11
Parallel and distributed computing
Most simple programs are sequential: step one finishes before step two starts. Easy to follow, but slow …
2:30
Impact of computing
Every innovation in this unit has done real good and real harm, usually to different people. Computing t…