Simple integer comparison problem

[Bart Willems]

>     if points > 89 and points <= 100:
>         return "A"
>     elif points > 89 and points <= 89:
>         return "B"
>     elif points > 69 and points <= 79:
>         return "C"
>     elif points > 59 and points <= 69:
>         return "D"
>     else:
>         return "F"

The previous posters already pointed out your int problem. However, the 
if-statement can be written with a lot less clutter:

if points > 100:
     return "Illegal score"
elif points > 89:
     return "A"
elif points > 79:
     return "B"
elif points > 69:
     return "C"
elif points > 59:
     return "D"
else:
     return "F"

I have a feeling that there's a Python-solution that is shorter yet 
better readable, I just can't figure it out yet...