count the number of instances in a list python code example

Example 1: How to see how many times somting is in a list python

vowels = ['a', 'e', 'i', 'o', 'i', 'u']
count = vowels.count('i')

Example 2: how to find the number of times a number appears in python

dict((i, a.count(i)) for i in a)