CODEWITHSUNDEEP
python-3.x
dmbdnr
dmbdnr

Reputation: 334

Transform list into dictonary with counter values

I have a list, containing project names:

my_list = ['a', 'b', 'c', 'a', 'd', 'a', 'a']

I want to put the letters into a dictonary, with the key values containing the number, for how many time a letter is in a list:

my_dict = {'a' : 4, 'b' : 1, 'c' : 1, 'd' : 1}

How can I do this in python?

Upvotes: 0

Views: 60

Answers (1)

alecxe
alecxe

Reputation: 473823

This is exactly what collections.Counter is for:

A Counter is a dict subclass for counting hashable objects. It is an unordered collection where elements are stored as dictionary keys and their counts are stored as dictionary values. 

>>> from collections import Counter
>>> my_list = ['a', 'b', 'c', 'a', 'd', 'a', 'a']
>>> Counter(my_list)
Counter({'a': 4, 'c': 1, 'b': 1, 'd': 1})

Upvotes: 5

Related Questions