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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def inputs_valid(self, outputs=None):
 """Validates the Inputs in the Transaction against given Outputs. Note: Given a `CREATE` Transaction is passed, dummy values for Outputs are submitted for validation that evaluate parts of the validation-checks to `True`. Args: outputs (:obj:`list` of :class:`~bigchaindb.common. transaction.Output`):
 A list of Outputs to check the Inputs against. Returns: bool: If all Inputs are valid. """

        if self.operation == Transaction.CREATE:
            # NOTE: Since in the case of a `CREATE`-transaction we do not have
            #       to check for outputs, we're just submitting dummy
            #       values to the actual method. This simplifies it's logic
            #       greatly, as we do not have to check against `None` values.
            return self._inputs_valid(['dummyvalue'
                                       for _ in self.inputs])
        elif self.operation == Transaction.TRANSFER:
            return self._inputs_valid([output.fulfillment.condition_uri
                                       for output in outputs])
        else:
            allowed_ops = ', '.join(self.__class__.ALLOWED_OPERATIONS)
            raise TypeError('`operation` must be one of {}'
                            .format(allowed_ops))