Count the number of unique characters in a string Python using only for loops and ifel operations

Question

Like title says, I am supposed to find the number of unique characters in a string. Here's the catch, no arrays or even while loops (although for loop can accomplish this). I have tried but I can't seem to do it without writing a bunch of ridiculous if-el statements under a for loop checking each char value against each other.

Answer 1

Use this:

len(set("stackoverflow"))  # returns 12