[ipython] install ipykernel in multiple environments 多conda环境安装使用ipython

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I have multiple environments in anaconda, but ipython breaks and often casts module not found exception.

I had thought this is solved in this, but clearly it is not. python -m ipykernel install --user enables only the full execution of ipython in only one environment, and all the other keeps breaking.

This doc from the official site describes in detail how to install ipython in multiple environments:

1. switch to either environment and make sure ipykernel is installed
   conda install ipykernel
2. specify name for different environments
   python -m ipykernel install --user --name other-env --display-name "Python (other-env)"