父级在字典中为空时的安全get

def safe_get(dictionary, keys, default=None):
    for key in keys:
        if not dictionary or key not in dictionary:
            return default
        dictionary = dictionary[key]
    return dictionary

# 示例字典
data = {
    'a': {
        'b': {
            'c': 'value'
        }
    }
}

# 使用安全get方法获取值
result = safe_get(data, ['a', 'b', 'c'], 'default value')
print(result)  # 输出：value

result = safe_get(data, ['x', 'y', 'z'], 'default value')
print(result)  # 输出：default value

result = safe_get(data, ['a', 'x', 'z'], 'default value')
print(result)  # 输出：default value