解决python -m pip install --upgrade pip 升级不成功问题

1、使用命令出现、

You are using pip version 9.0.1, however version 19.1.1 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
PS D:安装Python36-32Lib>
PS D:安装Python36-32Lib>
PS D:安装Python36-32Lib> python -m pip install --upgrade pip
Collecting pip
  Downloading https://files.pythonhosted.org/packages/5c/e0/be401c003291b56efc55aeba6a80ab790d3d4cece2778288d65323009420/pip-19.1.1-py2.py3-none-any.whl (1.4MB)
    3% |█                               | 40kB 1.4kB/s eta 0:16:01Exception:
Traceback (most recent call last):
  File "D:安装Python36-32libsite-packagespip\_vendor
equestspackagesurllib3
esponse.py", line 232, in _error_catcher
    yield
  File "D:安装Python36-32libsite-packagespip\_vendor
equestspackagesurllib3
esponse.py", line 314, in read
    data = self._fp.read(amt)
  File "D:安装Python36-32libsite-packagespip\_vendorcachecontrolfilewrapper.py", line 60, in read
    data = self.__fp.read(amt)
  File "D:安装Python36-32Libhttpclient.py", line 449, in read
    n = self.readinto(b)
  File "D:安装Python36-32Libhttpclient.py", line 493, in readinto
    n = self.fp.readinto(b)
  File "D:安装Python36-32Libsocket.py", line 586, in readinto
    return self._sock.recv_into(b)
  File "D:安装Python36-32Libssl.py", line 1009, in recv_into
    return self.read(nbytes, buffer)
  File "D:安装Python36-32Libssl.py", line 871, in read
    return self._sslobj.read(len, buffer)
  File "D:安装Python36-32Libssl.py", line 631, 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:安装Python36-32libsite-packagespipasecommand.py", line 215, in main
    status = self.run(options, args)
  File "D:安装Python36-32libsite-packagespipcommandsinstall.py", line 324, in run
    requirement_set.prepare_files(finder)
  File "D:安装Python36-32libsite-packagespip
eq
eq_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "D:安装Python36-32libsite-packagespip
eq
eq_set.py", line 620, in _prepare_file
    session=self.session, hashes=hashes)
  File "D:安装Python36-32libsite-packagespipdownload.py", line 821, in unpack_url
    hashes=hashes
  File "D:安装Python36-32libsite-packagespipdownload.

2、问题解决，这是因为服务器连接超时，使用一下代码即可解决

python -m pip install --upgrade pip -i https://pypi.douban.com/simple