mac下 Python 2.7.5，执行setup.py报错，如下：
Searching for six>=1.8.0
Reading
http://pypi.python.org/simple/six/Download error: [Errno 60] Operation timed out -- Some packages may not be found!
Couldn't find index page for 'six' (maybe misspelled?)
Scanning index of all packages (this may take a while)
Reading
http://pypi.python.org/simple/Download error: [Errno 60] Operation timed out -- Some packages may not be found!
No local packages or download links found for six>=1.8.0
error: Could not find suitable distribution for Requirement.parse('six>=1.8.0')
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