Test if all N variables are different

Question

I want to make a condition where all selected variables are not equal. My solution so far is to compare every pair which doesn't scale well:

if A!=B and A!=C and B!=C:

I want to do the same check for multiple variables, say five or more, and it gets quite confusing with that many. What can I do to make it simpler?

Answer 1

Create a set and check whether the number of elements in the set is the same as the number of variables in the list that you passed into it:

>>> variables = [a, b, c, d, e]
>>> if len(set(variables)) == len(variables):
...     print("All variables are different")

A set doesn't have duplicate elements so if you create a set and it has the same number of elements as the number of elements in the original list then you know all elements are different from each other.