python字符串p型编码

想问一下python的字符串p型编码怎么做呀,急等😭求各位好汉帮

import itertools as it 

s = '122344111'

res = [str(len(list(v))) + i for i , v in it.groupby(s)]
result = ''.join(res)
print(result)
"""--result
1122132431
"""