Because of the sorted bit, a == c means a == b == c, so the equilateral condition can be a == c and the isosceles condition can be a == b or b == c.

Nice. You should however choose another variable for 'sum' - you are shadowing Python's "sum".

but is fast lol

You can use a == b == c istead of a == b and b == c

this is still the cleanest solution, 4 years later

so smart~

hahaha you are right but this is what codewars is about to use your brain and give your best

You know one is free to do whatever he fancies?

We don't do that here, screen space is expensive (that was sarcasm, of course).

You know you don't always have to write a one liner.
You can write the same code spaced out into 3 or 4 lines.
Doesn't hurt anyone, rather reduces confusion.

Do you know what is the madnes?

hahahaha perfect

Lmao wtf