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/rpythond.py

@@ -0,0 +1,55 @@
+#! /usr/bin/env python3
+
+# Remote python server.
+# Execute Python commands remotely and send output back.
+# WARNING: This version has a gaping security hole -- it accepts requests
+# from any host on the Internet!
+
+import sys
+from socket import socket, AF_INET, SOCK_STREAM
+import io
+import traceback
+
+PORT = 4127
+BUFSIZE = 1024
+
+def main():
+    if len(sys.argv) > 1:
+        port = int(sys.argv[1])
+    else:
+        port = PORT
+    s = socket(AF_INET, SOCK_STREAM)
+    s.bind(('', port))
+    s.listen(1)
+    while True:
+        conn, (remotehost, remoteport) = s.accept()
+        print('connection from', remotehost, remoteport)
+        request = b''
+        while 1:
+            data = conn.recv(BUFSIZE)
+            if not data:
+                break
+            request += data
+        reply = execute(request.decode())
+        conn.send(reply.encode())
+        conn.close()
+
+def execute(request):
+    stdout = sys.stdout
+    stderr = sys.stderr
+    sys.stdout = sys.stderr = fakefile = io.StringIO()
+    try:
+        try:
+            exec(request, {}, {})
+        except:
+            print()
+            traceback.print_exc(100)
+    finally:
+        sys.stderr = stderr
+        sys.stdout = stdout
+    return fakefile.getvalue()
+
+try:
+    main()
+except KeyboardInterrupt:
+    pass