打开您的~/.bashrc文件，查看是否存在该行-

Open your ~/.bashrc file and see if this line is there -

export PIP_REQUIRE_VIRTUALENV=true

这可能是造成麻烦的原因.如果存在，将其更改为false并运行-

It might be causing the trouble. If it's there, change it to false and run -

source ~/.bashrc

如果没有，请从终端运行export PIP_REQUIRE_VIRTUALENV=false.

If not, run export PIP_REQUIRE_VIRTUALENV=false from terminal.

注意:如果当前用户的根目录中使用的是.bash_profile而不是.bashrc，则所有操作均相同.

Note: everything works the same if you have .bash_profile instead of .bashrc in your current user's root directory.