如何用递归算法实现字符串分割？

def split_string_recursive(string, sep):    if not sep in string:        return [string]    index = string.index(sep)    return [string[:index]] + split_string_recursive(string[index + 1:], sep)string = "A1B3C2D2E"result = split_string_recursive(string, "1")print(result)  # 输出：['A', 'B3C2D2E']result = split_string_recursive(string, "2")print(result)  # 输出：['A', 'B3C', 'D', 'E']