安装代码：sudo pip install tensorflow==2.0.0-beta0
问题描述如下：

ERROR: Exception:
Traceback (most recent call last):
 File "/usr/local/lib/python3.6/dist-packages/pip/_vendor/urllib3/response.py", line 425, in _error_catcher
   yield
 File "/usr/local/lib/python3.6/dist-packages/pip/_vendor/urllib3/response.py", line 507, in read
   data = self._fp.read(amt) if not fp_closed else b""
 File "/usr/lib/python3.6/http/client.py", line 459, in read
   n = self.readinto(b)
 File "/usr/lib/python3.6/http/client.py", line 503, in readinto
   n = self.fp.readinto(b)
 File "/usr/lib/python3.6/socket.py", line 586, in readinto
   return self._sock.recv_into(b)
 File "/usr/lib/python3.6/ssl.py", line 1012, in recv_into
   return self.read(nbytes, buffer)
 File "/usr/lib/python3.6/ssl.py", line 874, in read
   return self._sslobj.read(len, buffer)
 File "/usr/lib/python3.6/ssl.py", line 631, in read
   v = 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 "/usr/local/lib/python3.6/dist-packages/pip/_internal/cli/base_command.py", line 188, in _main
   status = self.run(options, args)
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/cli/req_command.py", line 185, in wrapper
   return func(self, options, args)
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/commands/install.py", line 333, in run
   reqs, check_supported_wheels=not options.target_dir
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/resolution/legacy/resolver.py", line 179, in resolve
   discovered_reqs.extend(self._resolve_one(requirement_set, req))
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/resolution/legacy/resolver.py", line 362, in _resolve_one
   abstract_dist = self._get_abstract_dist_for(req_to_install)
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/resolution/legacy/resolver.py", line 314, in _get_abstract_dist_for
   abstract_dist = self.preparer.prepare_linked_requirement(req)
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/operations/prepare.py", line 469, in prepare_linked_requirement
   hashes=hashes,
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/operations/prepare.py", line 259, in unpack_url
   hashes=hashes,
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/operations/prepare.py", line 130, in get_http_url
   link, downloader, temp_dir.path, hashes
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/operations/prepare.py", line 281, in _download_http_url
   for chunk in download.chunks:
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/cli/progress_bars.py", line 166, in iter
   for x in it:
 File "/usr/local/lib/python3.6/dist-packages/pip/_internal/network/utils.py", line 39, in response_chunks
   decode_content=False,
 File "/usr/local/lib/python3.6/dist-packages/pip/_vendor/urllib3/response.py", line 564, in stream
   data = self.read(amt=amt, decode_content=decode_content)
 File "/usr/local/lib/python3.6/dist-packages/pip/_vendor/urllib3/response.py", line 529, in read
   raise IncompleteRead(self._fp_bytes_read, self.length_remaining)
 File "/usr/lib/python3.6/contextlib.py", line 99, in __exit__
   self.gen.throw(type, value, traceback)
 File "/usr/local/lib/python3.6/dist-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='files.pythonhosted.org', port=443): Read timed out.

求解决方法