現(xiàn)象：使用pip安裝時出現(xiàn)如下錯誤：
Traceback (most recent call last):
? File "d:\anaconda 3\lib\site-packages\pip\_vendor\urllib3\response.py", line 425, in _error_catcher
? ? yield
? File "d:\anaconda 3\lib\site-packages\pip\_vendor\urllib3\response.py", line 507, in read
? ? data = self._fp.read(amt) if not fp_closed else b""
? File "d:\anaconda 3\lib\site-packages\pip\_vendor\cachecontrol\filewrapper.py", line 62, in read
? ? data = self.__fp.read(amt)
? File "d:\anaconda 3\lib\http\client.py", line 447, in read
? ? n = self.readinto(b)
? File "d:\anaconda 3\lib\http\client.py", line 491, in readinto
? ? n = self.fp.readinto(b)
? File "d:\anaconda 3\lib\socket.py", line 589, in readinto
? ? return self._sock.recv_into(b)
? File "d:\anaconda 3\lib\ssl.py", line 1049, in recv_into
? ? return self.read(nbytes, buffer)
? File "d:\anaconda 3\lib\ssl.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 "d:\anaconda 3\lib\site-packages\pip\_internal\cli\base_command.py", line 188, in _main
? ? status = self.run(options, args)
? File "d:\anaconda 3\lib\site-packages\pip\_internal\cli\req_command.py", line 185, in wrapper
? ? return func(self, options, args)
? File "d:\anaconda 3\lib\site-packages\pip\_internal\commands\install.py", line 333, in run
? ? reqs, check_supported_wheels=not options.target_dir
? File "d:\anaconda 3\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 179, in resolve
? ? discovered_reqs.extend(self._resolve_one(requirement_set, req))
? File "d:\anaconda 3\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 362, in _resolve_one
? ? abstract_dist = self._get_abstract_dist_for(req_to_install)
? File "d:\anaconda 3\lib\site-packages\pip\_internal\resolution\legacy\resolver.py", line 314, in _get_abstract_dist_for
? ? abstract_dist = self.preparer.prepare_linked_requirement(req)
? File "d:\anaconda 3\lib\site-packages\pip\_internal\operations\prepare.py", line 469, in prepare_linked_requirement
? ? hashes=hashes,
? File "d:\anaconda 3\lib\site-packages\pip\_internal\operations\prepare.py", line 259, in unpack_url
? ? hashes=hashes,
? File "d:\anaconda 3\lib\site-packages\pip\_internal\operations\prepare.py", line 130, in get_http_url
? ? link, downloader, temp_dir.path, hashes
? File "d:\anaconda 3\lib\site-packages\pip\_internal\operations\prepare.py", line 281, in _download_http_url
? ? for chunk in download.chunks:
? File "d:\anaconda 3\lib\site-packages\pip\_internal\cli\progress_bars.py", line 166, in iter
? ? for x in it:
? File "d:\anaconda 3\lib\site-packages\pip\_internal\network\utils.py", line 39, in response_chunks
? ? decode_content=False,
? File "d:\anaconda 3\lib\site-packages\pip\_vendor\urllib3\response.py", line 564, in stream
? ? data = self.read(amt=amt, decode_content=decode_content)
? File "d:\anaconda 3\lib\site-packages\pip\_vendor\urllib3\response.py", line 529, in read
? ? raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
? File "d:\anaconda 3\lib\contextlib.py", line 130, in __exit__
? ? self.gen.throw(type, value, traceback)
? File "d:\anaconda 3\lib\site-packages\pip\_vendor\urllib3\response.py", line 430, in _error_catcher
? ? raise ReadTimeoutError(self._pool, None, "Read timed out.")
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='pypi.tuna.tsinghua.edu.cn', port=443): Read timed out.
原因：由于頻繁訪問網(wǎng)站或請求造成的，可以通過更換國內源的方法來解決此問題。
解決：
pip install scrapy -i http://pypi.douban.com/simple --trusted-host pypi.douban.com
附加幾個國內常用鏡像：
中國科技大學 https://pypi.mirrors.ustc.edu.cn/simple/
清華大學 https://pypi.tuna.tsinghua.edu.cn/simple/
阿里云 http://mirrors.aliyun.com/pypi/simple/
中國科學技術大學 http://pypi.mirrors.ustc.edu.cn/simple/
豆瓣(douban) http://pypi.douban.com/simple/
