I think the documentation for collections.Counter can be updated slightly to include an example showing the initialization of a counter object from a list. For example, it explains how to manually iterate through a list and increment the values...

for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:
...     cnt[word] += 1

I think it is more useful and powerful to do something like this:

cnt = Counter(['red', 'blue', 'red', 'green', 'blue', 'blue'])

where the result would be:

Counter({'blue': 3, 'red': 2, 'green': 1})

Just a thought. I'm curious to see what other people think.

I'm -0 on this as it seems to be six of one, half a dozen of the other,  but I don't get the final say :)

The introductory example already shows both ways of using a Counter:

1) How to tally one at a time:

   cnt = Counter()
   for word in ['red', 'blue', 'red', 'green', 'blue', 'blue']:
       cnt[word] += 1

2) How to count directly from a list:

    words = re.findall(r'\w+', open('hamlet.txt').read().lower())
    Counter(words).most_common(10)