异常信息：
D:\Python2.7\Scripts>pip install lxml
Collecting lxml
Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'ConnectTimeoutError(<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0x0426BAD0>, 'Connection to pypi.python.org timed out. (connect timeout=15)')': /simple/lxml/
Downloading lxml-3.7.3-cp27-cp27m-win32.whl (2.9MB)
12% |████ | 358kB 37kB/s eta 0:01:07Exception:
Traceback (most recent call last):
File "d:\python2.7\lib\site-packages\pip\basecommand.py", line 215, in main
status = self.run(options, args)
File "d:\python2.7\lib\site-packages\pip\commands\install.py", line 335, in run
wb.build(autobuilding=True)
File "d:\python2.7\lib\site-packages\pip\wheel.py", line 749, in build
self.requirement_set.prepare_files(self.finder)
File "d:\python2.7\lib\site-packages\pip\req\req_set.py", line 380, in prepare_files
ignore_dependencies=self.ignore_dependencies))
File "d:\python2.7\lib\site-packages\pip\req\req_set.py", line 620, in _prepare_file
session=self.session, hashes=hashes)
File "d:\python2.7\lib\site-packages\pip\download.py", line 821, in unpack_url
hashes=hashes
File "d:\python2.7\lib\site-packages\pip\download.py", line 659, in unpack_http_url
hashes)
File "d:\python2.7\lib\site-packages\pip\download.py", line 882, in _download_http_url
_download_url(resp, link, content_file, hashes)
File "d:\python2.7\lib\site-packages\pip\download.py", line 603, in _download_url
hashes.check_against_chunks(downloaded_chunks)
File "d:\python2.7\lib\site-packages\pip\utils\hashes.py", line 46, in check_against_chunks
for chunk in chunks:
File "d:\python2.7\lib\site-packages\pip\download.py", line 571, in written_chunks
for chunk in chunks:
File "d:\python2.7\lib\site-packages\pip\utils\ui.py", line 139, in iter
for x in it:
File "d:\python2.7\lib\site-packages\pip\download.py", line 560, in resp_read
decode_content=False):
File "d:\python2.7\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 357, in stream
data = self.read(amt=amt, decode_content=decode_content)
File "d:\python2.7\lib\site-packages\pip\_vendor\requests\packages\urllib3\response.py", line 324, in read
flush_decoder = True
File "d:\python2.7\lib\contextlib.py", line 35, in __exit__
self.gen.throw(type, value, traceback)
File "d:\python2.7\lib\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.
通过网上查询发现有许多都是说从对应官网上下载的麻烦方法，但是没有一个成功的，于是发现了Python的第三方库也是有镜像的所以。。。。。。
安装库异常的话可以采用镜像的方法只需要在第三方库的模块前加上–index https://pypi.mirrors.ustc.edu.cn/simple/即可成功
pip install --index https://pypi.mirrors.ustc.edu.cn/simple/ lxml
D:\Python2.7\Scripts>pip install --index https://pypi.mirrors.ustc.edu.cn/simple/ lxml
Collecting lxml
Downloading https://mirrors.ustc.edu.cn/pypi/web/packages/00/99/ff24b35b5be614a019cbf495fe9c27af2c712f88f3ff066e3705ef5256bd/lxml-3.7.3-cp27-cp27m-win32.whl (2.9MB)
100% |████████████████████████████████| 2.9MB 359kB/s
Installing collected packages: lxml
Successfully installed lxml-3.7.3
