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pymunk
Pymunk is a easy-to-use pythonic 2d physics library that can be used whenever you need 2d rigid body physics from Python
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InfluxDB
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If your asking how he can learn about physics engine themselves and how they work, I think that a good starting point would be to program a naïve one. In Python it is relatively easy to draw simple shapes on screen (pyglet for instance) and to move them around. Then he could add his own physics logic to simulate the dynamics of his world. That is what pymunk (source) does.
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