np.count_nonzero()

np.count_nonzero(arr)

Returns the number of non-zero entries in arr. True counts as 1, False counts as 0.

Input:

arr : array

The array to count non-zero entries in.

Returns:

The number of non-zero entries in the array.

Return Type:

integer

---

is_cat_arr = np.array(pets.get('Is_Cat'))
is_cat_arr

array([False, True, True, False, False, False, False, True])

np.count_nonzero(is_cat_arr)

3

age_arr = np.array(pets.get('Age'))
age_arr

array([5. , 0.2, 9. , 2. , 0.5, 3. , 0.2, 0. ])

np.count_nonzero(age_arr)

7