Python count occurrences of each element in list code example

Example 1: how to find the number of times a number appears in python

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

Example 2: 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 3: count occurrence in array python

arr = np.array( [1, 2, 3, 2, 1, 2])
occ = np.count_nonzero(arr==0)
print(occ)
0
occ = np.count_nonzero(arr==1)
print(occ)
2

Example 4: python count occurrences of an item in a list

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