Comparing characters in a string sequentially in Python

Question

I am trying to figure out how to compare a character in a string to the next character in the string. For example, if I have a string:

s = \'vzcbotdebobeggg         


        

Answer 1

This is less obvious, but seems to work:

seq = "vzcbotdebobeggglakyl"

import itertools
result = max(
    (
        list(next(sub)) + [b for a, b in sub]
        for ascending, sub in itertools.groupby(zip(seq,seq[1:]), lambda x: x[0] <= x[1])
        if ascending
    ),
    key=len
)

print ''.join(result)