How to check if characters in a string are alphabetically ordered

Question

I have been trying these code but there is something wrong. I simply want to know if the first string is alphabetical.

def alp(s1):
    s2=sorted(s1)
    if s2 i         


        

Answer 1

You could see this answer and use something which works for any sequence:

all(s1[i] <= s1[i+1] for i in xrange(len(s1) - 1))

Example:

>>> def alp(s1):
...     return all(s1[i] <= s1[i+1] for i in xrange(len(s1) - 1))
...
>>> alp("test")
False
>>> alp("abcd")
True