pip安装报错：HTTPSConnectionPool(host=‘‘, port=443): Read timed out.

D:\Python39\Scripts>pip install opencv-python==4.5.2.54 Collecting opencv-python==4.5.2.54 Downloading opencv_python-4.5.2.54-cp39-cp39-win_amd64.whl (34.7 MB) |████████████████████████████████| 34.7 MB 656 kB/s Collecting numpy>=1.19.3 Downloading numpy-1.21.1-cp39-cp39-win_amd64.whl (14.0 MB) |████████████ | 5.2 MB 142 kB/s eta 0:01:03ERROR: Exception: Traceback (most recent call last): File "d:\python39\lib\site-packages\pip\_vendor\urllib3\r", line 438, in _error_catcher yield File "d:\python39\lib\site-packages\pip\_vendor\urllib3\r", line 519, in read data = self._fp.read(amt) if not fp_closed else b"" File "d:\python39\lib\site-packages\pip\_vendor\cachecontrol\f", line 62, in read data = self.__fp.read(amt) File "d:\python39\lib\http\c", line 455, in read n = (b) File "d:\python39\lib\http\c", line 499, in readinto n = (b) File "d:\python39\lib\", line 704, in readinto return self._sock.recv_into(b) File "d:\python39\lib\", line 1241, in recv_into return (nbytes, buffer) File "d:\python39\lib\", line 1099, in read return self._sslobj.read(len, buffer) : The read operation timed out During handling of the above exception, another exception occurred: Traceback (most recent call last): File "d:\python39\lib\site-packages\pip\_internal\cli\base_command.py", line 173, in _main status = (options, args) File "d:\python39\lib\site-packages\pip\_internal\cli\req_command.py", line 203, in wrapper return func(self, options, args) File "d:\python39\lib\site-packages\pip\_internal\commands\", line 315, in run requirement_set = ( File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\r", line 94, in resolve result = self._result = ( File "d:\python39\lib\site-packages\pip\_vendor\resolvelib\r", line 472, in resolve state = (requirements, max_rounds=max_rounds) File "d:\python39\lib\site-packages\pip\_vendor\resolvelib\r", line 366, in resolve failure_causes = self._attempt_to_pin_criterion(name) File "d:\python39\lib\site-packages\pip\_vendor\resolvelib\r", line 212, in _attempt_to_pin_criterion criteria = self._get_updated_criteria(candidate) File "d:\python39\lib\site-packages\pip\_vendor\resolvelib\r", line 203, in _get_updated_criteria self._add_to_criteria(criteria, requirement, parent=candidate) File "d:\python39\lib\site-packages\pip\_vendor\resolvelib\r", line 172, in _add_to_criteria if not : File "d:\python39\lib\site-packages\pip\_vendor\resolvelib\", line 151, in __bool__ return bool(self._sequence) File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 140, in __bool__ return any(self) File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 128, in <genexpr> return (c for c in iterator if id(c) not in self._incompatible_ids) File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\found_candidates.py", line 32, in _iter_built candidate = func() File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\f", line 204, in _make_candidate_from_link self._link_candidate_cache[link] = LinkCandidate( File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\c", line 295, in __init__ super().__init__( File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\c", line 156, in __init__ = self._prepare() File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\c", line 227, in _prepare dist = self._prepare_distribution() File "d:\python39\lib\site-packages\pip\_internal\resolution\resolvelib\c", line 305, in _prepare_distribution return self._factory.preparer.prepare_linked_requirement( File "d:\python39\lib\site-packages\pip\_internal\operations\", line 508, in prepare_linked_requirement return self._prepare_linked_requirement(req, parallel_builds) File "d:\python39\lib\site-packages\pip\_internal\operations\", line 550, in _prepare_linked_requirement local_file = unpack_url( File "d:\python39\lib\site-packages\pip\_internal\operations\", line 239, in unpack_url file = get_http_url( File "d:\python39\lib\site-packages\pip\_internal\operations\", line 102, in get_http_url from_path, content_type = download(link, temp_dir.path) File "d:\python39\lib\site-packages\pip\_internal\network\", line 145, in __call__ for chunk in chunks: File "d:\python39\lib\site-packages\pip\_internal\cli\progress_bars.py", line 144, in iter for x in it: File "d:\python39\lib\site-packages\pip\_internal\network\", line 63, in response_chunks for chunk in ( File "d:\python39\lib\site-packages\pip\_vendor\urllib3\r", line 576, in stream data = (amt=amt, decode_content=decode_content) File "d:\python39\lib\site-packages\pip\_vendor\urllib3\r", line 541, in read raise IncompleteRead(self._fp_bytes_read, self.length_remaining) File "d:\python39\lib\c", line 135, in __exit__ (type, value, traceback) File "d:\python39\lib\site-packages\pip\_vendor\urllib3\r", line 443, in _error_catcher raise ReadTimeoutError(self._pool, None, "Read timed out.") pip._vendor.: HTTPSConnectionPool(host='', port=443): Read timed out.