def add_group_email_grant(self, permission, email_address, headers=None):
        acl = self.get_acl(headers=headers)
        acl.add_group_email_grant(permission, email_address)
        self.set_acl(acl, headers=headers)
Convenience method that provides a quick way to add an email group
dataset/ETHPy150Open yyuu/botornado/boto/gs/key.py/Key.add_group_email_grant