方法一

import numpy as np

a = np.array([0, 3, 0, 1, 0, 1, 2, 1, 0, 0, 0, 0, 1, 3, 4])
unique, counts = np.unique(a, return_counts=True)
dict(zip(unique, counts))

>>> output: {0: 7, 1: 4, 2: 1, 3: 2, 4: 1}

方法二

import numpy as np

a = np.array([0, 3, 0, 1, 0, 1, 2, 1, 0, 0, 0, 0, 1, 3, 4])
collections.Counter(a)
 
>>> output: Counter({0: 7, 1: 4, 3: 2, 2: 1, 4: 1})

方法三

import numpy as np
a = np.array([0, 3, 0, 1, 0, 1, 2, 1, 0, 0, 0, 0, 1, 3, 4])
print(np.sum(a == 1))

>>> output: 4