def keys(self):
        if self.list is None:
            raise TypeError, "not indexable"
        return list(set(item.name for item in self.list))
If the environment variable is set, do not ignore it. However, the
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/cgi.py/FieldStorage.keys--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.5/tests/regressiontests/settings_tests/tests.py/EnvironmentVariableTest.test_env_var_used