more swig upddates.

packages/swig/python/demo.py

@@ -0,0 +1,20 @@
+# python commands
+
+import sys
+import yap
+
+engine = yap.YAPEngine();
+# engine = yap.YAPEngine(yap.YAPParams());
+
+def go():
+    while True:
+        s = raw_input("Prolog Query: ")
+        q = engine.query(s)
+        while q.next():
+            vs = q.namedVars();
+            while vs.length() > 0:
+                eq = vs.car()
+                print eq.text()
+                print eq.getArg(1).text() + " = " + eq.getArg(2).text()
+                vs = vs.cdr()
+            print "no more answers"