def up_(self, rev):
     return MigrationStep.upgrade_from_script(self.env.revision_map, rev)
 def down_(self, rev):
     return MigrationStep.downgrade_from_script(
         self.env.revision_map, rev)
 def down_(self, rev):
     return MigrationStep.downgrade_from_script(self.env.revision_map, rev)
 def up_(self, rev):
     return MigrationStep.upgrade_from_script(
         self.env.revision_map, rev)