python撤销删除

# 示例代码
original_list = [1, 2, 3, 4, 5]
backup_list = []

# 删除操作前备份
backup_list = original_list.copy()

# 执行删除操作
del original_list[2]

print("删除后的列表:", original_list)

# 撤销删除操作
original_list = backup_list.copy()

print("撤销删除后的列表:", original_list)

# 示例代码
class UndoableList:
    def __init__(self):
        self.data = []
        self.undo_stack = []

    def append(self, item):
        self.data.append(item)

    def remove(self, item):
        if item in self.data:
            self.undo_stack.append((item, self.data.index(item)))
            self.data.remove(item)

    def undo(self):
        if self.undo_stack:
            item, index = self.undo_stack.pop()
            self.data.insert(index, item)

# 使用示例
ul = UndoableList()
ul.append(1)
ul.append(2)
ul.append(3)
ul.remove(2)
print("删除后的列表:", ul.data)
ul.undo()
print("撤销删除后的列表:", ul.data)