Python 3.6.9 (default, Jul 21 2019, 14:33:59)
[GCC 7.4.0] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
>>> display = ":7"
>>> data = b'l\x00\x0b\x00\x00\x00\x12\x00\x10\x00\x00\x00MIT-MAGIC-COOKIE-1\x00\x00\xc5\xc1C\xc1Y}\xe6\x1e\x88P\xab\x98\xd0\x91<%'
>>> import select
>>> from Xlib.support import lock, connect
>>> name, protocol, host, displayno, screenno = connect.get_display(display)
>>> socket = connect.get_socket(name, protocol, host, displayno)
>>> i = socket.send(data)
>>> select.select([socket], [], [], None)
([<socket.socket fd=3, family=AddressFamily.AF_UNIX, type=SocketKind.SOCK_STREAM, proto=0, raddr=/tmp/.X11-unix/X7>], [], [])
>>> socket.recv(512)
b'\x01\x00\x0b\x00\x00\x00:\x07\xd0\xab\xb5\x00\x00\x00`\x00\xff\xff\x1f\x00\x00\x01\x00\x00\x18\x00\xff\xff\x01\x06\x00\x00  \x08\xff\x00\x00\x00\x00The Cygwin Ports project

Python 3.6.13 (default, Feb 16 2021, 07:46:47)
[GCC 10.2.0] on cygwin
Type "help", "copyright", "credits" or "license" for more information.
...
>>> socket.recv(512)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ConnectionResetError: [Errno 104] Connection reset by peer