如何从字符串中提取出名字、中间和姓氏。以及如何识别没有输入中间名的情况

def extract_name_parts(name_string):
    name_parts = name_string.split()
    num_spaces = name_string.count(" ")

    if num_spaces == 0:
        first_name = name_parts[0]
        middle_name = ""
        last_name = ""
    elif num_spaces == 1:
        first_name = name_parts[0]
        middle_name = ""
        last_name = name_parts[1]
    else:
        first_name = name_parts[0]
        middle_name = name_parts[1]
        last_name = name_parts[2]

    return first_name, middle_name, last_name

name = "张三"
first_name, middle_name, last_name = extract_name_parts(name)
print("姓氏:", first_name)
print("中间名:", middle_name)
print("名字:", last_name)

name = "张大三"
first_name, middle_name, last_name = extract_name_parts(name)
print("姓氏:", first_name)
print("中间名:", middle_name)
print("名字:", last_name)

姓氏: 张
中间名:
名字: 三

姓氏: 张
中间名: 大
名字: 三