I am working with collections.Counter()
counters. I would like to combine two of them in a meaningful manner.
Suppose I have 2 counters, say,
Counter({'menu': 20, 'good': 15, 'happy': 10, 'bar': 5})
and
Counter({'menu': 1, 'good': 1, 'bar': 3})
I am trying to end up with:
Counter({'menu': 21, 'good': 16, 'happy': 10,'bar': 8})
How can I do this?
Counter is a subclass of dict that's specially designed for counting hashable objects in Python. It's a dictionary that stores objects as keys and counts as values. To count with Counter , you typically provide a sequence or iterable of hashable objects as an argument to the class's constructor.
A Counter is a dict subclass for counting hashable objects. It is a collection where elements are stored as dictionary keys and their counts are stored as dictionary values. Counts are allowed to be any integer value including zero or negative counts.
Use a formula sum = sum + current number . At last, after the loop ends, calculate the average using a formula average = sum / n . Here, The n is a number entered by the user.
All you need to do is add them:
>>> from collections import Counter >>> a = Counter({'menu': 20, 'good': 15, 'happy': 10, 'bar': 5}) >>> b = Counter({'menu': 1, 'good': 1, 'bar': 3}) >>> a + b Counter({'menu': 21, 'good': 16, 'happy': 10, 'bar': 8})
From the docs:
Several mathematical operations are provided for combining Counter objects to produce multisets (counters that have counts greater than zero). Addition and subtraction combine counters by adding or subtracting the counts of corresponding elements.
Note that if you want to save memory by modifying the Counter
in-place rather than creating a new one, you can do a.update(b)
or b.update(a)
.
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With