[Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/itsdangerous-1.1.0.dist-info'

Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/itsdangerous-1.1.0.dist-info'
Consider using the `--user` option or check the permissions.

 

解决方法：

在你的 install 命令后面加上  --user

例如 ：原始命令 ： pip install flask

改为： pip install --user flask