缺少six兼容库导致import html5lib告警问题！

I just installed html5lib for Python with Windows Command Prompt. The package was installed here:

File "C:\Python27\lib\site-packages\html5lib
However, if I try to import html5lib:

#! /usr/bin/python
import html5lib
I get the following error:

Traceback (most recent call last):
File "C:\Users\workspace\testhtml5\src\test.py", line 2, in
import html5lib
File "C:\Python27\lib\site-packages\html5lib\__init__.py", line 16, in
from .html5parser import HTMLParser, parse, parseFragment
File "C:\Python27\lib\site-packages\html5lib\html5parser.py", line 2, in
from six import with_metaclass
ImportError: No module named six

虽然安装html5lib库但是import一样有以上告警，查了一下stackflow说是缺了six库！安装完之后正常了。