Windows下出现ImportError: cannot import name IncompleteRead

cmd> pip install -U setuptools

Traceback (most recent call last):
  File "C:\Python27\Scripts\pip-script.py", line 9, in <module>
    load_entry_point('pip==1.5.6', 'console_scripts', 'pip')()
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 356, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 2431, in load_entry_point
    return ep.load()
  File "C:\Python27\lib\site-packages\pkg_resources.py", line 2147, in load
    ['__name__'])
  File "C:\Python27\lib\site-packages\pip\__init__.py", line 11, in <module>
    from pip.vcs import git, mercurial, subversion, bazaar  # noqa
  File "C:\Python27\lib\site-packages\pip\vcs\mercurial.py", line 9, in <module>
    from pip.download import path_to_url
  File "C:\Python27\lib\site-packages\pip\download.py", line 26, in <module>
    from requests.compat import IncompleteRead
ImportError: cannot import name IncompleteRead

解决方法：

将File "C:\Python27\lib\site-packages\pip\download.py", line 26, in <module>
    from requests.compat import IncompleteRead
注释掉，加上from httplib import IncompleteRead

问题解决：
cmd> pip install -U setuptools
Downloading/unpacking setuptools from https://pypi.python.org/packages/3.4/s/setuptools/setuptools-7.0-
py2.py3-none-any.whl#md5=918e7e5ea108507e1ffbbdfccc3496b1
Installing collected packages: setuptools
  Found existing installation: setuptools 3.6
    Uninstalling setuptools:
      Successfully uninstalled setuptools
Successfully installed setuptools

Cleaning up...