如何对字典进行动态嵌套更新？

def update_dict(dic, key, value):
    for k, v in dic.items():
        if k == key:
            dic[k] = value
        elif isinstance(v, dict):
            update_dict(v, key, value)

my_dict = {
    'key1': 'value1',
    'key2': {
        'nested_key1': 'nested_value1',
        'nested_key2': 'nested_value2'
    }
}

update_dict(my_dict, 'nested_key1', 'new_nested_value1')

print(my_dict)

{
    'key1': 'value1',
    'key2': {
        'nested_key1': 'new_nested_value1',
        'nested_key2': 'nested_value2'
    }
}

def update_dict(dic, key, value):
    stack = [(dic, key)]
    while stack:
        cur_dict, cur_key = stack.pop()
        for k, v in cur_dict.items():
            if k == cur_key:
                cur_dict[k] = value
            elif isinstance(v, dict):
                stack.append((v, cur_key))