如何根据字典中的键值将字典中的值居中？

def center_values(dictionary):
    # 找出最长的值的长度
    max_length = max(len(str(value)) for value in dictionary.values())

    for key, value in dictionary.items():
        # 计算左右两侧空格的数量
        spaces = max_length - len(str(value))
        left_spaces = spaces // 2
        right_spaces = spaces - left_spaces

        # 居中对齐
        centered_value = ' ' * left_spaces + str(value) + ' ' * right_spaces

        # 更新字典中的值
        dictionary[key] = centered_value

    return dictionary

my_dict = {'key1': 'value1', 'key2': 'value2', 'key3': 'value3'}
centered_dict = center_values(my_dict)
print(centered_dict)

{'key1': ' value1 ', 'key2': ' value2 ', 'key3': ' value3 '}