install swig and box2d-py for windows

I encountered an error when I want to use the lunar_lander environment in gym. The error is :

error: “module ‘gym.envs.box2d’ has no attribute ‘LunarLander’”

I searched on internet and found the solution:

download swig for windows, unzip to a folder and add the folder to the PATH environment variable.
pip install box2d-py

Refer to :

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