本文详细解析了pip在安装过程中遇到的权限错误、缓存禁用问题及依赖库不兼容的情况，提供了具体的解决方案，包括使用sudo命令、升级pip版本和安装缺失的依赖库。
40:441: execution error: The directory ‘/Users/lina/Library/Caches/pip/http’ or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo’s -H flag.
The directory ‘/Users/lina/Library/Caches/pip’ or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo’s -H flag.
matplotlib 1.3.1 requires nose, which is not installed.
pyopenssl 19.0.0 has requirement six>=1.5.2, but you’ll have six 1.4.1 which is incompatible.
sphinx 1.8.5 has requirement six>=1.5, but you’ll have six 1.4.1 which is incompatible.
Cannot uninstall ‘pyparsing’. 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.
You are using pip version 10.0.1, however version 19.0.3 is available.
You should consider upgrading via the ‘pip install --upgrade pip’ command.
解决方案：
sudo pip install --ignore-installed flask-SQLAlchemy
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