def _index_for(self, minified_src):
        if minified_src not in self._indices:
            with open(os.path.join(self._dir, minified_src + '.map')) as fp:
                self._indices[minified_src] = sourcemap.load(fp)

        return self._indices[minified_src]
alternate: django-admin builtin commands fail if settings file (from environment) doesn't exist
dataset/ETHPy150Open zulip/zulip/zerver/lib/unminify.py/SourceMap._index_for--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/tests/regressiontests/admin_scripts/tests.py/DjangoAdminAlternateSettings.test_builtin_with_bad_environment