近期练习flask写个blog, 安装flask扩展时 pip install Flask-WTF 报ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/itsdangerous' Consider using the `--user` option or check the permission…
更新pip模块的版本:python -m pip install --upgrade pip 但是遇到报错提示: Could not install packages due to an EnvironmentError: [WinError 5] 拒绝访问.: 'c:\program files (x86)\python\python37\lib\site-packages\pip-19.0.3.dist-info\entry_points.txt' Consider using the --…
安装xlrd包的时候,总是报错:ERROR: Could not install packages due to an EnvironmentError: HTTPConnectionPool (host='127.0.0.1', port=8888): Max retries exceeded with url: http://pypi.douban .com/simple/ (Caused by ProxyError('Cannot connect to proxy.', NewConnec…