Python virtual environment

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To create a virtual environment:

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# navigate to the dedicated directory 
# this command creates venv_X in the current directory 
virtualenv venv_X

# create virtual env with a specific version of Python
## here /usr/bin/python3 is Python 3.8.2
virtualenv --python=/usr/bin/python3 venv_msr

To install the kernel for Jupyter notebook:

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cd venv_X/
source bin/activate 
pip3 install --upgrade pip 
pip3 install ipykernel

python3 -m ipykernel install --user --name=venv_X

# install packages
pip3 install --upgrade matplotlib 
pip3 install --upgrade ipywidgets 
pip3 install --upgrade pandas 
pip3 install --upgrade sklearn 
pip3 install --upgrade opencv-python 

# 按顺序做完以上步骤之后激活虚拟环境或者不激活虚拟环境，都可以直接通过在 jupyter notebook 命令进入notebook并选与虚拟环境对应的kernel

To activate the virtual environment:

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source venv_X/bin/activate

To deactivate the virtual environment:

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deactivate

To delete the virtual environment:

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rm -r venv_X

To uninstall the kernel for Jupyter notebook:

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jupyter kernelspec uninstall venv_X

To see which kernels are available for Jupyter notebook:

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jupyter kernelspec list