Simplify with built-in functions where possible. e.g.

change [x for x in y if x] to filter(None, y)
change [f(x) for x in y] to map(f, x)
change [x for x in y] to list(y)

These changes reduce source code size and complexity and produce some minor performance gains

svn: r14104

src/plugins/tool/ExtractCity.py

@@ -578,7 +578,7 @@ class ExtractCity(Tool.BatchTool, ManagedWindow.ManagedWindow):
         return
 
     def toggled(self, cell, path_string):
-        path = tuple([int (i) for i in path_string.split(':')])
+        path = tuple(map(int, path_string.split(':')))
         row = self.model[path]
         row[0] = not row[0]