how to count the number of times an item appears in a lsit 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: count occurrences of value in array python

>>> l = ["a","b","b"]
>>> l.count("a")