pipenv的使用
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https://blog.csdn.net/qq_44614026/article/details/126064163

.. code:: 

   pipenv shell

需要提前安装pyenv

.. code:: 

   pipenv install --python 2.7.12

.. code:: 

   pipenv --rm

.. code:: 

   pip install scons==3.0.0  -i https://mirror.baidu.com/pypi/simple