python用env

创建环境

python3 -m venv tutorial-env

启动环境

source tutorial-env/bin/activate

用pip管理包

 python -m pip install

查看包： pip show ，pip list

pip freeze will produce a similar list of the installed packages, but the output uses the format that pip install expects. A common convention is to put this list in a requirements.txt file:

pip freeze > requirements.txt

The requirements.txt can then be committed to version control and shipped as part of an application. Users can then install all the necessary packages with install -r:

 python -m pip install -r requirements.txt

退出： deactivate