PyBullet is a module for physics simulation, robotics and deep reinforcement learning. It's an easy to use package and highly recommended for real-time collision detection, multi-physics for VR simulations, etc. The tag should be used when asking questions about Python implementations of the Bullet Physics SDK.
PyBullet is a Python package based upon the infamous Bullet Physics SDK/Engine for which the developer, Erwin Coumans, even won a Scientific and Technical Academy Award. The Python module has implemented most of the features the original C++ SDK has as well - referring to this GitHub repository.
With PyBullet comes a lot of functionality (for the list click here), including but not limited to physics simulation, robotics, deep reinforcement learning, dynamics simulation, inverse dynamics computation and so on. Aside from physics simulation, you're also able to either render it via CPU or visualize the data via OpenGL.