Python 安装第三方库，超时报错--Read timed out.

Python 安装 pillow
pip install pillow
报错如下：

Collecting pillow
  Downloading Pillow-5.3.0 (1.8MB)

Exception:
Traceback (most recent call last):
  File "C:python-workspacevenvlibsite-packagespip_vendorrequestspackagesurllib3response.py", line 232, in _error_catcher
    yield
  File "C:python-workspacevenvlibsite-packagespip_vendorrequestspackagesurllib3response.py", line 314, in read
    data = self._fp.read(amt)
  File "C:python-workspacevenvlibsite-packagespip_vendorcachecontrolfilewrapper.py", line 60, in read
    data = self.__fp.read(amt)
  File "C:pythonpython37Libhttpclient.py", line 447, in read
    n = self.readinto(b)
  File "C:pythonpython37Libhttpclient.py", line 491, in readinto
    n = self.fp.readinto(b)
  File "C:pythonpython37Libsocket.py", line 589, in readinto
    return self._sock.recv_into(b)
  File "C:pythonpython37Libssl.py", line 1049, in recv_into
    return self.read(nbytes, buffer)
  File "C:pythonpython37Libssl.py", line 908, in read
    return 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 "C:python-workspacevenvlibsite-packagespipbasecommand.py", line 215, in main
    status = self.run(options, args)
  File "C:python-workspacevenvlibsite-packagespipcommandsinstall.py", line 335, in run
    wb.build(autobuilding=True)
  File "C:python-workspacevenvlibsite-packagespipwheel.py", line 749, in build
    self.requirement_set.prepare_files(self.finder)
  File "C:python-workspacevenvlibsite-packagespipreqreq_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "C:python-workspacevenvlibsite-packagespipreqreq_set.py", line 620, in _prepare_file
    session=self.session, hashes=hashes)
  File "C:python-workspacevenvlibsite-packagespipdownload.py", line 821, in unpack_url
    hashes=hashes
  File "C:python-workspacevenvlibsite-packagespipdownload.py", line 659, in unpack_http_url
    hashes)
  File "C:python-workspacevenvlibsite-packagespipdownload.py", line 882, in _download_http_url
    _download_url(resp, link, content_file, hashes)
  File "C:python-workspacevenvlibsite-packagespipdownload.py", line 603, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "C:python-workspacevenvlibsite-packagespiputilshashes.py", line 46, in check_against_chunks
    for chunk in chunks:
  File "C:python-workspacevenvlibsite-packagespipdownload.py", line 571, in written_chunks
    for chunk in chunks:
  File "C:python-workspacevenvlibsite-packagespiputilsui.py", line 139, in iter
    for x in it:
  File "C:python-workspacevenvlibsite-packagespipdownload.py", line 560, in resp_read
    decode_content=False):
  File "C:python-workspacevenvlibsite-packagespip_vendorrequestspackagesurllib3response.py", line 357, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "C:python-workspacevenvlibsite-packagespip_vendorrequestspackagesurllib3response.py", line 324, in read
    flush_decoder = True
  File "C:pythonpython37Libcontextlib.py", line 130, in __exit__
    self.gen.throw(type, value, traceback)
  File "C:python-workspacevenvlibsite-packagespip_vendorrequestspackagesurllib3response.py", line 237, in _error_catcher
    raise ReadTimeoutError(self._pool, None, 'Read timed out.')
pip._vendor.requests.packages.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='pypi.python.org', port=443): Read timed out.

进入python安装目录下的Scripts内，打开控制台输入命令

C:UserssunziAppDataLocalProgramsPythonPython36Scripts>pip3 --default-timeout=100 install -U

然后提示：
You must give at least one requirement to install (see “pip help install”)

之后就可以继续安装了

最后

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