有sudo的pip，但是pip列出了过期的包

Question

我用sudo pip3安装了下面的一些包，但是pip再次打印过期包。如何成功安装？

 Package                      Version   Latest      Type
---------------------------- --------- ----------- -----
bleach                       1.5.0     2.0.0       wheel
html5lib                     0.9999999 0.999999999 wheel
jupyter-contrib-nbextensions 0.3.0     0.3.1       wheel
...
murmurhash                   0.26.4    0.28.0      sdist
nbconvert                    5.2.1     5.3.1       wheel
pyasn1-modules               0.1.1     0.1.4       wheel


⇒  sudo pip3 install html5lib

Password:
The directory '/Users/william/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/william/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.
Requirement already satisfied: html5lib in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages
Requirement already satisfied: six in /Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages (from html5lib)**

Answer 1

为了升级已安装的包，需要将--upgrade标志传递给pip install，例如：

sudo pip3 install --upgrade html5lib