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