ImportError: cannot import name Counter

Question

I have tried using Counter() but everytime I do:

from collections import Counter

I get an error saying:

Traceback (most recent call last):
  File "<web session>", line 1, in <module>
ImportError: cannot import name Counter

Do I actually have to make a file that has counter in it and then import it from there or something? I am a beginner so only the most basic answer will do.

Answer 1

Counter is only supported python2.7 and higher and is not available in earlier versions.

Answer 2

Use

from collections import Counter

and be sure that the C letter of Counter is a capital letter.

Answer 3

You can just cast the list to a set instead:

l = ['a','b', 'c', 'a', 'd', 'e', 's', 'd', 'e', 'c']
print (len(set(l)) #prints  6