@classmethod
    def prefix(cls, field, pre):

        return cls(prefix={field: pre})
Return a mock patching the variable with qualified name *q_var_name*.
dataset/ETHPy150Open ooici/elasticpy/elasticpy/filter.py/ElasticFilter.prefix--crossover with--dataset/ETHPy150Open python-openxml/python-docx/tests/unitutil/mock.py/var_mock