[Tutor] (no subject)

[Danny Yoo]

>         if curraverage>= 90:
>             grade= "A"
>             lettergrades.append(grade)
>         else:
>             if curraverage >= 80 and curraverage < 90:
>                 grade= "B"
>                 lettergrades.append(grade)
>             else:
>                 if curraverage >= 70 and curraverage < 80:
>                     grade= "C"
>                     lettergrades.append(grade)
>                 else:
>                     if curraverage < 70:
>                         grade= "F"
>                         lettergrades.append(grade)


Just wanted to note that this style of cascading if statements is a
little unusual here.  Since you know that only one of the tests is
going to be true, you can use a more parallel structure.

That is, if you're doing something like:

##################
if test1:
   ...
   else:
        if test2:
            ...
        else:
            if test3:
                ...
            else:
                ...
##################

and if you know that test1, test2, and test3 don't overlap, you can
express this as:


##################
if test1:
    ...
elif test2:
    ...
elif test3:
    ...
else:
    ...
##################

and avoid the Tower of Pisa-style code.