--- a/svgui/svgui_server.py	Sat Aug 19 01:11:27 2017 +0300
+++ b/svgui/svgui_server.py	Sat Aug 19 16:30:15 2017 +0300
@@ -55,7 +55,7 @@
         self.inputs[attrname] = value
 
     def getinput(self, attrname, default=None):
-        if not attrname in self.inputs:
+        if attrname not in self.inputs:
             self.inputs[attrname] = default
         return self.inputs[attrname]