CODEWITHSUNDEEP
pythonpython-3.xcounter
Baz
Baz

Reputation: 13135

Sum of all counts in a collections.Counter

What is the best way of establishing the sum of all counts in a collections.Counter object?

I've tried:

sum(Counter([1,2,3,4,5,1,2,1,6]))

but this gives 21 instead of 9?

Upvotes: 73

Views: 77707

Answers (4)

Xavier Guihot
Xavier Guihot

Reputation: 61666

Starting in Python 3.10, Counter is given a total() function which provides the sum of the counts:

from collections import Counter

Counter([1,2,3,4,5,1,2,1,6]).total()
# 9

Upvotes: 36

NPE
NPE

Reputation: 500367

The code you have adds up the keys (i.e. the unique values in the list: 1+2+3+4+5+6=21).

To add up the counts, use:

In [4]: sum(Counter([1,2,3,4,5,1,2,1,6]).values())
Out[4]: 9

This idiom is mentioned in the documentation, under "Common patterns".

Upvotes: 94

martyn
martyn

Reputation: 716

sum(Counter([1,2,3,4,5,1,2,1,6]).values())

Upvotes: 4

Martijn Pieters
Martijn Pieters

Reputation: 1122152

Sum the values:

sum(some_counter.values())

Demo:

>>> from collections import Counter
>>> c = Counter([1,2,3,4,5,1,2,1,6])
>>> sum(c.values())
9

Upvotes: 29

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