pip install time out

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Sometimes when pip install ** will encounter such result:

Downloading pymongo-3.4.0-cp27-cp27m-macosx_10_12_intel.whl (288kB)
14% |████▌ | 40kB 4.6kB/s eta 0:00:55Exception:
Traceback (most recent call last):
File "/Library/Python/2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/Library/Python/2.7/site-packages/pip/commands/install.py", line 335, in run
wb.build(autobuilding=True)
File "/Library/Python/2.7/site-packages/pip/wheel.py", line 749, in build
self.requirement_set.prepare_files(self.finder)
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "/Library/Python/2.7/site-packages/pip/req/req_set.py", line 620, in _prepare_file
session=self.session, hashes=hashes)
File "/Library/Python/2.7/site-packages/pip/download.py", line 821, in unpack_url
hashes=hashes
File "/Library/Python/2.7/site-packages/pip/download.py", line 659, in unpack_http_url
hashes)
File "/Library/Python/2.7/site-packages/pip/download.py", line 882, in _download_http_url
_download_url(resp, link, content_file, hashes)
File "/Library/Python/2.7/site-packages/pip/download.py", line 603, in _download_url
hashes.check_against_chunks(downloaded_chunks)
File "/Library/Python/2.7/site-packages/pip/utils/hashes.py", line 46, in check_against_chunks
for chunk in chunks:
File "/Library/Python/2.7/site-packages/pip/download.py", line 571, in written_chunks
for chunk in chunks:
File "/Library/Python/2.7/site-packages/pip/utils/ui.py", line 139, in iter
for x in it:
File "/Library/Python/2.7/site-packages/pip/download.py", line 560, in resp_read
decode_content=False):
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/packages/urllib3/response.py", line 357, in stream
data = self.read(amt=amt, decode_content=decode_content)
File "/Library/Python/2.7/site-packages/pip/_vendor/requests/packages/urllib3/response.py", line 324, in read
flush_decoder = True
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/contextlib.py", line 35, in __exit__
self.gen.throw(type, value, traceback)
File "/Library/Python/2.7/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.

Resolution:

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

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