python一串字母切割_Python 分割文本使得 字母和数字 分开？

我写了个不用groupby也不用re正则的

from itertools import groupby

import re

def exp_str(s):

"""只用标准库函数"""

s += s[-2]

p = 0

for index, item in enumerate(s):

try:

n = index + 1

sn = s[n]

except IndexError:

_ = s[p: index]

if _:

yield _

if item.isdigit() and sn.isdigit():

continue

elif item.isalpha() and sn.isalpha():

continue

else:

yield s[p: n]

p = index + 1

def use_group(s):

"""这是用groupby的情况"""

return [''.join(list(g)) for k, g in groupby(s, key=lambda x: x.isdigit())]

def use_re(s):

"""这是用正则表达式的情况"""

return re.findall(r'[0-9]+|[a-z]+', s)

然后顺路跑了个分，如图

处理长度为10W的字符串：