diff -r ac0fe8aabb5e -r b45f2768fab1 svgui/pyjs/lib/pyjslib.py
--- a/svgui/pyjs/lib/pyjslib.py	Sat Aug 19 01:11:27 2017 +0300
+++ b/svgui/pyjs/lib/pyjslib.py	Sat Aug 19 16:30:15 2017 +0300
@@ -894,11 +894,11 @@
         return self.items().__iter__()
 
     def setdefault(self, key, default_value):
-        if not key in self:
+        if key not in self:
             self[key] = default_value
 
     def get(self, key, default_=None):
-        if not key in self:
+        if key not in self:
             return default_
         return self[key]