operators.py 文件源码

def mutate_unpack(self, node):
        target = node.targets[0]
        value = node.value
        new_targets = []
        new_values = []
        for target_element, value_element in zip(target.elts, value.elts):
            if not self.is_overridden(node, getattr(target_element, 'id', None)):
                new_targets.append(target_element)
                new_values.append(value_element)
        if len(new_targets) == len(target.elts):
            raise MutationResign()
        if not new_targets:
            return ast.Pass()
        elif len(new_targets) == 1:
            node.targets = new_targets
            node.value = new_values[0]
            return node
        else:
            target.elts = new_targets
            value.elts = new_values
            return node