def __init__(self, variable):
        assert isinstance(variable, Variable), "%s is not a Variable" % variable
        self.variable = variable
Params:
dataset/ETHPy150Open nltk/nltk/nltk/sem/logic.py/AbstractVariableExpression.__init__--crossover with--dataset/ETHPy150Open treasure-data/td-client-python/tdclient/job_api.py/JobAPI.list_jobs