[pip-20.1.1]     File "/cygdrive/d/a/sage/sage/local/var/tmp/sage/build/pip-20.1.1/src/src/pip/_vendor/urllib3/__init__.py", line 7, in <module>
  [pip-20.1.1]       from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool, connection_from_url
  [pip-20.1.1]     File "/cygdrive/d/a/sage/sage/local/var/tmp/sage/build/pip-20.1.1/src/src/pip/_vendor/urllib3/connectionpool.py", line 29, in <module>
  [pip-20.1.1]       from .connection import (
  [pip-20.1.1]     File "/cygdrive/d/a/sage/sage/local/var/tmp/sage/build/pip-20.1.1/src/src/pip/_vendor/urllib3/connection.py", line 68, in <module>
  [pip-20.1.1]       class HTTPConnection(_HTTPConnection, object):
  [pip-20.1.1]     File "/cygdrive/d/a/sage/sage/local/var/tmp/sage/build/pip-20.1.1/src/src/pip/_vendor/urllib3/connection.py", line 96, in HTTPConnection
  [pip-20.1.1]       default_socket_options = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)]
  [pip-20.1.1]   AttributeError: module 'socket' has no attribute 'TCP_NODELAY'