I am having trouble coding an animation for a pendulum simulation. I can never seem to get any of the code right. I tried using pygame, but it didn't work even after I installed it into my computer! I just need to know where to start! Help please!!!

I already used tose links, but none of them work on my laptop. Most of those use pygame, and for some reason my laptop (Macbook air running OS X Yosemite) will not work even if I download it.

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