如何将字符串拆分成3个长度未知的独立字符串

def split_string(string):
    n = len(string)
    avg_length = n // 3
    remainder = n % 3

    # 计算每个字符串的长度
    lengths = [avg_length] * 3
    lengths[0] += remainder

    # 按照计算得到的长度截取子字符串
    substrings = []
    start = 0
    for length in lengths:
        substrings.append(string[start:start+length])
        start += length

    return substrings

# 示例用法
string = "abcdefghijk"
substrings = split_string(string)
print(substrings)