delete identical entries in a list

[Pedroski55]

I have a list of student numbers which looks like this (except the numbers are like 1625010201 and the list is longer):

['123','123','123','456', '456', '456', '789', '789', '789']

What is the best way to get rid of identical entries, so that my list then will look like:

['123', '456', '789']

I've been trying various loops but I can't seem to get it right. Grateful for any tips!