我如何在".“上拆分。但只有在后面有非数字的情况下？

import re

def split_string(string):
    parts = string.split(".")
    result = []
    for part in parts:
        if re.search("\D$", part):
            match = re.search("(\d+)(\D+)$", part)
            if match:
                result.append(match.group(1))
                result.append(match.group(2))
        else:
            result.append(part)
    return result

# 示例用法
string = "abc.123.xyz.456"
result = split_string(string)
print(result)