python pip安装报错: ConnectTimeoutError
错误:

解决方案:
 https://pypi.douban.com/simple
https://pypi.douban.com/simple  https://pypi.douban.com/simple
https://pypi.douban.com/simple File "d:\programs\python35\lib\site-packages\pip\_vendor\requests\packages\urllib3\
 response.py
response.py
", line 226, in _error_catcher
    yield
  File "d:\programs\python35\lib\site-packages\pip\_vendor\requests\packages\urllib3\ response.py
response.py
", line 301, in read
    data = self._fp.read(amt)
  File "d:\programs\python35\lib\site-packages\pip\_vendor\cachecontrol\ filewrapper.py
filewrapper.py
", line 49, in read
    data = self.__fp.read(amt)
  File "d:\programs\python35\lib\http\ client.py
client.py
", line 448, in read
    n = self.readinto(b)
  File "d:\programs\python35\lib\http\ client.py
client.py
", line 488, in readinto
    n = self.fp.readinto(b)
  File "d:\programs\python35\lib\ socket.py
socket.py
", line 575, in readinto
    return self._sock.recv_into(b)
  File "d:\programs\python35\lib\ ssl.py
ssl.py
", line 929, in recv_into
    return self.read(nbytes, buffer)
  File "d:\programs\python35\lib\ ssl.py
ssl.py
", line 791, in read
    return self._sslobj.read(len, buffer)
  File "d:\programs\python35\lib\ ssl.py
ssl.py
", line 575, in read
    v = self._sslobj.read(len, buffer)
socket.timeout: The read operation timed out
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "d:\programs\python35\lib\site-packages\pip\ basecommand.py
basecommand.py
", line 209, in main
    status = self.run(options, args)
  File "d:\programs\python35\lib\site-packages\pip\commands\ install.py
install.py
", line 299, in run
    requirement_set.prepare_files(finder)
  File "d:\programs\python35\lib\site-packages\pip\req\req_ set.py
set.py
", line 360, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "d:\programs\python35\lib\site-packages\pip\req\req_ set.py
set.py
", line 577, in _prepare_file
    session=self.session, hashes=hashes)
  File "d:\programs\python35\lib\site-packages\pip\ download.py
download.py
", line 810, in unpack_url
    hashes=hashes
  File "d:\programs\python35\lib\site-packages\pip\ download.py
download.py
", line 649, in unpack_http_url
    hashes)
  File "d:\programs\python35\lib\site-packages\pip\ download.py
download.py
", line 871, in _download_http_url
    _download_url(resp, link, content_file, hashes)
  File "d:\programs\python35\lib\site-packages\pip\ download.py
download.py
", line 595, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "d:\programs\python35\lib\site-packages\pip\utils\ hashes.py
hashes.py
", line 46, in check_against_chunks
    for chunk in chunks:
  File "d:\programs\python35\lib\site-packages\pip\ download.py
download.py
", line 563, in written_chunks
    for chunk in chunks:
  File "d:\programs\python35\lib\site-packages\pip\utils\ ui.py
ui.py
", line 139, in iter
    for x in it:
  File "d:\programs\python35\lib\site-packages\pip\ download.py
download.py
", line 552, in resp_read
    decode_content=False):
  File "d:\programs\python35\lib\site-packages\pip\_vendor\requests\packages\urllib3\ response.py
response.py
", line 344, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "d:\programs\python35\lib\site-packages\pip\_vendor\requests\packages\urllib3\ response.py
response.py
", line 311, in read
    flush_decoder = True
  File "d:\programs\python35\lib\ contextlib.py
contextlib.py
", line 77, in __exit__
    self.gen.throw(type, value, traceback)
  File "d:\programs\python35\lib\site-packages\pip\_vendor\requests\packages\urllib3\ response.py
response.py
", line 231, in _error_catcher
    raise ReadTimeoutError(self._pool, None, 'Read timed out.')
pip._vendor.requests.packages.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host=' files.pythonhosted.org
files.pythonhosted.org
', port=443): Read timed out.
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