from south.modelsinspector import add_introspection_rules from django.conf import settings if "timezones" in settings.INSTALLED_APPS: try: from timezones.fields import TimeZoneField except ImportError: pass else: rules = [ ( (TimeZoneField, ), [], { "blank": ["blank", {"default": True}], "max_length": ["max_length", {"default": 100}], }, ), ] add_introspection_rules(rules, ["^timezones\.fields",])