Count number of instances of a string in a list

Question

I have a list of strings, X. Each entry x_i in X is one from a set of possible strings Y. How can I count the number of instances of string y_j in X?

score 2 · Answer 1 · edited May 23 '17 at 12:05

2

A solution from here:

from collections import Counter
X = ['blue', 'red', 'blue', 'yellow', 'blue', 'red']
print Counter(X).items()

Output:

[('blue', 3), ('yellow', 1), ('red', 2)]

edited May 23 '17 at 12:05

Community

1
1

answered Aug 10 '14 at 20:54

Falko

17,076
13
60
105

Thanks, but what if I don't know the set `Y` in advance? – Karnivaurus Aug 10 '14 at 20:55
For this solution you don't need to know ```Y```. – Falko Aug 10 '14 at 20:57

Count number of instances of a string in a list

1 Answers1