Count the number of occurrences of a value in a list

Question

I have a list with the following values:

numeros = [5, 3, 1, 2, 3, 4, 5, 5, 5]

In Python would have some function to count how many times some value repeats?

For example: I want to know how many times the 5 repeated.

Answer 1

Using Python 2 or 3

Only use the method count()

numeros = [5, 3, 1, 2, 3, 4, 5, 5, 5]
numeros.count(5)

Answer 2

You can use the Counter:

import collections
numeros = [5, 3, 1, 2, 3, 4, 5, 5, 5]
repetidos = collections.Counter(numeros)
print(repetidos[5])

Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.

If you prefer the short form:

print(collections.Counter([5, 3, 1, 2, 3, 4, 5, 5, 5])[5])