pip安装第三方包超时

[root@24 zabbix_agentd.d]# pip install requests
Collecting requests
/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:318: SNIMissingWarning: An HTTPS request has been made, but the SNI (Subject Name Indication) extension to TLS is not available on this platform. This may cause the server to present an incorrect TLS certificate, which can cause validation failures. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#snimissingwarning.
  SNIMissingWarning
/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/util/ssl_.py:122: InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. You can upgrade to a newer version of Python to solve this. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.
  InsecurePlatformWarning
  Downloading requests-2.18.3-py2.py3-none-any.whl (88kB)
    100% |████████████████████████████████| 92kB 5.1kB/s 
Collecting chardet<3.1.0,>=3.0.2 (from requests)
  Downloading chardet-3.0.4-py2.py3-none-any.whl (133kB)
    100% |████████████████████████████████| 143kB 819bytes/s 
Collecting urllib3<1.23,>=1.21.1 (from requests)

  Downloading urllib3-1.22-py2.py3-none-any.whl (132kB)
Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 307, in run
    requirement_set.prepare_files(finder)
  File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 370, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 587, in _prepare_file
    session=self.session, hashes=hashes)
  File "/usr/lib/python2.7/site-packages/pip/download.py", line 810, in unpack_url
    hashes=hashes
  File "/usr/lib/python2.7/site-packages/pip/download.py", line 649, in unpack_http_url
    hashes)
  File "/usr/lib/python2.7/site-packages/pip/download.py", line 871, in _download_http_url
    _download_url(resp, link, content_file, hashes)
  File "/usr/lib/python2.7/site-packages/pip/download.py", line 595, in _download_url
    hashes.check_against_chunks(downloaded_chunks)
  File "/usr/lib/python2.7/site-packages/pip/utils/hashes.py", line 46, in check_against_chunks
    for chunk in chunks:
  File "/usr/lib/python2.7/site-packages/pip/download.py", line 563, in written_chunks
    for chunk in chunks:
  File "/usr/lib/python2.7/site-packages/pip/utils/ui.py", line 139, in iter
    for x in it:
  File "/usr/lib/python2.7/site-packages/pip/download.py", line 552, in resp_read
    decode_content=False):
  File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/response.py", line 353, in stream
    data = self.read(amt=amt, decode_content=decode_content)
  File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/response.py", line 320, in read
    flush_decoder = True
  File "/usr/lib64/python2.7/contextlib.py", line 35, in __exit__
    self.gen.throw(type, value, traceback)
  File "/usr/lib/python2.7/site-packages/pip/_vendor/requests/packages/urllib3/response.py", line 242, in _error_catcher
    raise ReadTimeoutError(self._pool, None, ‘Read timed out.‘)
ReadTimeoutError: HTTPSConnectionPool(host=‘pypi.python.org‘, port=443): Read timed out.

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