解决pip install 不成功问题

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

最后

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