More cleanup: Move some demos into a dedicated Tools/demo dir, move 2to3 demo to Tools, and remove all the other Demo content.

Tools/demo/rpython.py

@@ -0,0 +1,36 @@
+#! /usr/bin/env python3
+
+# Remote python client.
+# Execute Python commands remotely and send output back.
+
+import sys
+from socket import socket, AF_INET, SOCK_STREAM, SHUT_WR
+
+PORT = 4127
+BUFSIZE = 1024
+
+def main():
+    if len(sys.argv) < 3:
+        print("usage: rpython host command")
+        sys.exit(2)
+    host = sys.argv[1]
+    port = PORT
+    i = host.find(':')
+    if i >= 0:
+        port = int(port[i+1:])
+        host = host[:i]
+    command = ' '.join(sys.argv[2:])
+    s = socket(AF_INET, SOCK_STREAM)
+    s.connect((host, port))
+    s.send(command.encode())
+    s.shutdown(SHUT_WR)
+    reply = b''
+    while True:
+        data = s.recv(BUFSIZE)
+        if not data:
+            break
+        reply += data
+    print(reply.decode(), end=' ')
+    s.close()
+
+main()