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 is s1:
        return True
    else:
        return False

This always prints False and when i say print s1 or s2, it says “NameError: name ‘s1’ is not defined”

Answer 1

is is identity testing which compares the object IDs, == is the equality testing:

In [1]: s1 = "Hello World"
In [2]: s2 = "Hello World"

In [3]: s1 == s2
Out[3]: True

In [4]: s1 is s2
Out[4]: False

Also note that sorted returns a list, so change it to:

if ''.join(s2) == s1:

Or

if ''.join(sorted(s2)) == s1: