python pip install 第三方库，报错：Read timed out

报错具体信息：

 File "d:\python\python27\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "d:\python\python27\lib\site-packages\pip\commands\install.py", line 324, in run
    requirement_set.prepare_files(finder)
  File "d:\python\python27\lib\site-packages\pip\req\req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "d:\python\python27\lib\site-packages\pip\req\req_set.py", line 620, in _prepare_file
    session=self.session, hashes=hashes)
  File "d:\python\python27\lib\site-packages\pip\download.py", line 821, in unpack_url
    hashes=hashes
  File "d:\python\python27\lib\site-packages\pip\download.py", line 659, in unpack_http_url
    hashes)
  File "d:\python\python27\lib\site-packages\pip\download.py", line 882, in _download_http_url
    _download_url(resp, link, content_file, hashes)
  File "d:\python\python27\lib\site-packages\pip\download.py", line 603, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "d:\python\python27\lib\site-packages\pip\utils\hashes.py", line 46, in check_against_chunks
    for chunk in chunks:
  File "d:\python\python27\lib\site-packages\pip\download.py", line 571, in written_chunks
    for chunk in chunks:
  File "d:\python\python27\lib\site-packages\pip\utils\ui.py", line 139, in iter
    for x in it:
  File "d:\python\python27\lib\site-packages\pip\download.py", line 560, in resp_read
    decode_content=False):
  File "d:\python\python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 357, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "d:\python\python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 324, in read
    flush_decoder = True
  File "d:\python\python27\lib\contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "d:\python\python27\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 246, in _error_catcher
    raise ReadTimeoutError(self._pool, None, 'Read timed out.')
ReadTimeoutError: HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed out.

解决方法：

pip --default-timeout=100 install -U pip