如何在Python中对字符串中的连续字母进行分组？

import re

def group_letters(string):
    groups = []
    for match in re.finditer(r'(\w)\1*', string):
        groups.append(match.group())
    return groups

string = "aaabbbcccdddeee"
result = group_letters(string)
print(result)

['aaa', 'bbb', 'ccc', 'ddd', 'eee']