pip insall pipenv
安装pipenv的时候报错，错误提示：
ERROR: Cannot uninstall 'filelock'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
解决方法：
pip install --ignore-installed filelock -i https://pypi.douban.com/simple pipenv
输入命令后安装成功