操作系统：macOS。
凡是在使用"pip3 install XXX"时，都会出现如下报错。
和网上别人提出的报错内容不太一致，网上看到的方法都试过了也没有用。所以来请求大佬们帮助。
ERROR: Exception:
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/urllib3/response.py", line 397, in _error_catcher
yield
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/urllib3/response.py", line 479, in read
data = self._fp.read(amt)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/cachecontrol/filewrapper.py", line 62, in read
data = self.__fp.read(amt)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 457, in read
n = self.readinto(b)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/http/client.py", line 501, in readinto
n = self.fp.readinto(b)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/socket.py", line 589, in readinto
return self._sock.recv_into(b)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 1071, in recv_into
return self.read(nbytes, buffer)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/ssl.py", line 929, 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 "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/cli/base_command.py", line 188, in main
status = self.run(options, args)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/commands/install.py", line 345, in run
resolver.resolve(requirement_set)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/legacy_resolve.py", line 196, in resolve
self._resolve_one(requirement_set, req)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/legacy_resolve.py", line 359, in _resolve_one
abstract_dist = self._get_abstract_dist_for(req_to_install)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/legacy_resolve.py", line 307, in _get_abstract_dist_for
self.require_hashes
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/operations/prepare.py", line 199, in prepare_linked_requirement
progress_bar=self.progress_bar
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/download.py", line 1064, in unpack_url
progress_bar=progress_bar
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/download.py", line 924, in unpack_http_url
progress_bar)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/download.py", line 1152, in _download_http_url
_download_url(resp, link, content_file, hashes, progress_bar)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/download.py", line 861, in _download_url
hashes.check_against_chunks(downloaded_chunks)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/utils/hashes.py", line 75, in check_against_chunks
for chunk in chunks:
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/download.py", line 829, in written_chunks
for chunk in chunks:
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/utils/ui.py", line 156, in iter
for x in it:
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_internal/download.py", line 818, in resp_read
decode_content=False):
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/urllib3/response.py", line 531, in stream
data = self.read(amt=amt, decode_content=decode_content)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/urllib3/response.py", line 496, in read
raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/contextlib.py", line 130, in __exit__
self.gen.throw(type, value, traceback)
File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/pip/_vendor/urllib3/response.py", line 402, in _error_catcher
raise ReadTimeoutError(self._pool, None, 'Read timed out.')
pip._vendor.urllib3.exceptions.ReadTimeoutError: HTTPSConnectionPool(host='files.pythonhosted.org', port=443): Read timed out.
