import numpy as np
a = [1,2,3,45,6,7,123,2,1,3,4,5,123,2,3,4]
def all_np(arr):
arr = np.array(arr)
key = np.unique(arr)
result = {}
for k in key:
mask = (arr == k)
arr_new = arr[mask]
v = arr_new.size
result[k] = v
return result
ret = all_np(a)
print(ret)
# 结果
# {1: 2, 2: 3, 3: 3, 4: 2, 5: 1, 6: 1, 7: 1, 45: 1, 123: 2}