如何替换嵌套字典中的值

def replace_nested_dict_value(nested_dict, old_value, new_value):
    for key, value in nested_dict.items():
        if isinstance(value, dict):
            replace_nested_dict_value(value, old_value, new_value)
        elif value == old_value:
            nested_dict[key] = new_value

# 示例用法
nested_dict = {
    'a': {
        'b': {
            'c': 1,
            'd': 2
        },
        'e': {
            'f': 3,
            'g': 4
        }
    },
    'h': {
        'i': 5,
        'j': 6
    }
}

replace_nested_dict_value(nested_dict, 2, 'new_value')

print(nested_dict)

{
    'a': {
        'b': {
            'c': 1,
            'd': 'new_value'
        },
        'e': {
            'f': 3,
            'g': 4
        }
    },
    'h': {
        'i': 5,
        'j': 6
    }
}