remove most uses of list(somedict.keys()) in Demo scripts
diff --git a/Demo/pdist/cmptree.py b/Demo/pdist/cmptree.py
index d6962e9..1e9f985e 100755
--- a/Demo/pdist/cmptree.py
+++ b/Demo/pdist/cmptree.py
@@ -89,7 +89,7 @@
                 else:
                     print("same mtime but different sum?!?!", end=' ')
                 print()
-    for name in list(lsumdict.keys()):
+    for name in lsumdict.keys():
         if not list(rsumdict.keys()):
             print(repr(name), "only locally", end=' ')
             fl()