失败信息如下：

c:\Python27\Scripts>pip install wordcloud-1.5.0-cp27-cp27m-win32.whl

Processing c:\python27\scripts\wordcloud-1.5.0-cp27-cp27m-win32.whl
Collecting pillow (from wordcloud==1.5.0)
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x03AF5810>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pillow/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x03AF5A50>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pillow/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x03AF5230>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pillow/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x03AF5910>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pillow/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x03AF5450>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/pillow/
  Could not find a version that satisfies the requirement pillow (from wordcloud==1.5.0) (from versions: )
No matching distribution found for pillow (from wordcloud==1.5.0)