.

wcfs/testprog/treedelta-genallstructs.py

@@ -85,7 +85,7 @@ DEL = 'ø'
 def diff(d1, d2): # -> [] of (k,v) to change; DEL means del[k]
     delta = []
     keys = set(d1.keys())
-    keys.union(d2.keys())
+    keys.update(d2.keys())
     for k in sorted(keys):
         v1 = d1.get(k, DEL)
         v2 = d2.get(k, DEL)
@@ -151,6 +151,8 @@ def treedeltaGenAllStructs(zstor, kv1txt, kv2txt, n):
 
     diff12 = diff(kv1, kv2) # of (k,v)  diff to go from kv1 to kv2
     diff21 = diff(kv2, kv1) # of (k,v)  diff to go from kv2 to kv1
+    print('diff12:', diff12)
+    print('diff21:', diff21)
 
     maxdepth=2  # XXX -> 3?
     maxsplit=1  # XXX -> 2?