https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_call

def call(self, _from=None, to=None, gas=None, gas_price=None, value=0,
             data=None, block="latest"):
        """
        https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_call
        """
        if _from is None:
            _from = self.default_from_address

        params = [
            get_transaction_params(_from, to, gas, gas_price, value, data),
            block,
        ]
        response = self.make_request("eth_call", params)
        return response['result']