Accessing counts associated to each elements [duplicate]

This question already has an answer here:

If a have a list of elements with theirs counts as below

[('a', 1), ('b', 2), ('c', 2),('d', 3), ('e', 3)]


And now I want to find out how many of them appear once,twice,and three times.
So the expected output would be something like

1:1,2:2,3:2


The list is generated by the Counter function Counter(lst)

Counter

Counter(lst)

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

2 Answers
2

Use another Counter on the values of your first Counter.

Counter

values

Counter

from collections import Counter

s = 'abbccdddeee'
c = Counter(s)
counts = Counter(c.values())


Use collections.Counter again but this time count second element in each tuple.

collections.Counter

from collections import Counter

lst = [('a', 1), ('b', 2), ('c', 2),('d', 3), ('e', 3)]

print(Counter(x[1] for x in lst)) # x[1] takes second element from each tuple.
# Counter({2: 2, 3: 2, 1: 1})