how to convert list to set while storing number of occurences in python code example

Example 1: python find number of occurrences in list

student_grades = [9.1, 8.8, 10.0, 7.7, 6.8, 8.0, 10.0, 8.1, 10.0, 9.9]

samebnumber = student_grades.count(10.0)

print(samebnumber)

Example 2: python count occurrences of an item in a list

>>> [1, 2, 3, 4, 1, 4, 1].count(1)
3