Counting the occurrence of unique letters in a string in Python 3

Question

There are many way for Counting the occurrence of unique letters in a string in Python 3. I just wanna know what is the best way for this job. Thanks.

Answer 1

if you need to count characters in string, try the following

a = "aaabbcccd"
b = dict.fromkeys(a, 0)
for i in a:
    b[i] += 1

b now holds the counts you require:

{'a': 3, 'c': 3, 'b': 2, 'd': 1}