1 files changed, 1 insertions, 1 deletions
diff --git a/examples/calc.py b/examples/calc.py
index ec1f039..2ac324a 100755
--- a/examples/calc.py
+++ b/examples/calc.py
@@ -311,7 +311,7 @@ class CellColumn( urwid.WidgetWrap ):
         if sub != 0:
             # f is not an edit widget
             return key
-        if OPERATORS.has_key(key):
+        if key in OPERATORS:
             # move trailing text to new cell below
             edit = self.walker.get_cell(i).edit
             cursor_pos = edit.edit_pos