How to tell how many duplicates in a list?

Question

Say my list is ['a', 'a', 'b'] how would I tell that the letter a appears twice? I know it's probably simple but I can't get my head around it...

https://docs.python.org/2/library/collections.html#collections.Counter — taras, Jun 23 '17 at 19:05
This question was already answered here: https://stackoverflow.com/questions/23240969/python-count-repeated-elements-in-the-list — Filipe Santos, Jun 23 '17 at 19:07

score 0 · Accepted Answer · answered Jun 23 '17 at 19:05

0

>>> a = ['a', 'a', 'b']
>>> a.count('a')
2

answered Jun 23 '17 at 19:05

syntaxError

1 Answers1