The code below should print out a dictionary of grades and how many times each grade appeared in a list.
def frequency(itemList):
counters = {}
for item in itemList:
if item not in counters:
counters[item] = 1
else:
counters[item] += 1
return counters
grades = [95, 96, 100, 85, 95, 90, 95, 100, 100]
print(frequency(grades))
When you fill in the blanks properly the code will output the following:
{95: 3, 96: 1, 100: 3, 85: 1, 90: 1}