C++ & swig

packages/swig/python/demo.py

@@ -9,14 +9,14 @@ engine = yap.YAPEngine();
 def go():
     while True:
         s = raw_input("Prolog Query: ")
-        try: 
-            q = engine.query(s)
-        except:
-            print "Oops!  That was no valid number.  Try again..."  
+        q = engine.query(s)
         while q.next():
             vs = q.namedVars();
-            while vs.length() > 0:
-                eq = vs.car()
-                print eq.getArg(1).text() + " = " + eq.getArg(2).text()
-                vs = vs.cdr()
+            if vs.length() == 0:
+              print "yes"
+            else:
+                while vs.length() > 0:
+                    eq = vs.car()
+                    print eq.getArg(1).text() + " = " + eq.getArg(2).text()
+                    vs = vs.cdr()
         print "no more answers"