The Isue with regard to `Import Error` or maybe Path Setting

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Hello, I'm using ROS kinetic on Ubuntu 16.04, and sorry for my poor English.

I would have wanted to install gym-gazebo, but I've failed for some reasons.

So I referred to here and I had gym module in my labtop.

However I got another problem soon; I can only be able to import gym module in gym directory.

Just so you know, what I did in there is just the below 3 commands:

$ git clone https://github.com/openai/gym.git

$ cd gym

$ sudo pip install -e .

How should I make it possible to import gym module at anywhere?

Thanks in advance. :)