Change export method from property to function to improve the semantic

exports/exports_factory.py

@@ -58,11 +58,10 @@ class ExportsFactory:
     """
     raise NotImplementedError()
 
-  @property
   def export(self):
     """
     Export the city model structure to the given export type
-    :return: City
+    :return: None
     """
     return getattr(self, self._export_type, lambda: None)
 

tests/test_exports.py

@@ -44,7 +44,7 @@ class TestExports(TestCase):
 
   def _export(self, export_type):
     self._city_gml = self._get_city()
-    ExportsFactory(export_type, self._city_gml, self._output_path).export
+    ExportsFactory(export_type, self._city_gml, self._output_path).export()
 
   def test_obj_export(self):
     self._export('obj')