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/gen/db/base.py

@@ -1601,7 +1601,7 @@ class DbWriteBase(object):
             self.set_default_person_handle(None)
     
         # loop through the family list 
-        for family_handle in [ f for f in person.get_family_handle_list() if f ]:
+        for family_handle in filter(None, person.get_family_handle_list()):
     
             family = self.get_family_from_handle(family_handle)