gh-97681: Remove Tools/demo/ directory (#97682)

Remove the Tools/demo/ directory which contained old demo scripts. A
copy can be found in the old-demos project:
https://github.com/gvanrossum/old-demos

Remove the following old demo scripts:

* beer.py
* eiffel.py
* hanoi.py
* life.py
* markov.py
* mcast.py
* queens.py
* redemo.py
* rpython.py
* rpythond.py
* sortvisu.py
* spreadsheet.py
* vector.py

Changes:

* Remove a reference to the redemo.py script in the regex howto
  documentation.
* Remove a reference to the removed Tools/demo/ directory in the
  curses documentation.
* Update PC/layout/ to remove the reference to Tools/demo/ directory.

1 files changed, 0 insertions, 82 deletions

diff --git a/Tools/demo/mcast.py b/Tools/demo/mcast.py
deleted file mode 100755
index 924c7c3e80..0000000000
--- a/Tools/demo/mcast.py
+++ /dev/null
@@ -1,82 +0,0 @@
-#!/usr/bin/env python3
-
-"""
-Send/receive UDP multicast packets.
-Requires that your OS kernel supports IP multicast.
-
-Usage:
-  mcast -s (sender, IPv4)
-  mcast -s -6 (sender, IPv6)
-  mcast    (receivers, IPv4)
-  mcast  -6  (receivers, IPv6)
-"""
-
-MYPORT = 8123
-MYGROUP_4 = '225.0.0.250'
-MYGROUP_6 = 'ff15:7079:7468:6f6e:6465:6d6f:6d63:6173'
-MYTTL = 1 # Increase to reach other networks
-
-import time
-import struct
-import socket
-import sys
-
-def main():
-    group = MYGROUP_6 if "-6" in sys.argv[1:] else MYGROUP_4
-
-    if "-s" in sys.argv[1:]:
-        sender(group)
-    else:
-        receiver(group)
-
-
-def sender(group):
-    addrinfo = socket.getaddrinfo(group, None)[0]
-
-    s = socket.socket(addrinfo[0], socket.SOCK_DGRAM)
-
-    # Set Time-to-live (optional)
-    ttl_bin = struct.pack('@i', MYTTL)
-    if addrinfo[0] == socket.AF_INET: # IPv4
-        s.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, ttl_bin)
-    else:
-        s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, ttl_bin)
-
-    while True:
-        data = repr(time.time()).encode('utf-8') + b'\0'
-        s.sendto(data, (addrinfo[4][0], MYPORT))
-        time.sleep(1)
-
-
-def receiver(group):
-    # Look up multicast group address in name server and find out IP version
-    addrinfo = socket.getaddrinfo(group, None)[0]
-
-    # Create a socket
-    s = socket.socket(addrinfo[0], socket.SOCK_DGRAM)
-
-    # Allow multiple copies of this program on one machine
-    # (not strictly needed)
-    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
-
-    # Bind it to the port
-    s.bind(('', MYPORT))
-
-    group_bin = socket.inet_pton(addrinfo[0], addrinfo[4][0])
-    # Join group
-    if addrinfo[0] == socket.AF_INET: # IPv4
-        mreq = group_bin + struct.pack('=I', socket.INADDR_ANY)
-        s.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
-    else:
-        mreq = group_bin + struct.pack('@I', 0)
-        s.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, mreq)
-
-    # Loop, printing any data we receive
-    while True:
-        data, sender = s.recvfrom(1500)
-        while data[-1:] == '\0': data = data[:-1] # Strip trailing \0's
-        print(str(sender) + '  ' + repr(data))
-
-
-if __name__ == '__main__':
-    main()