如何解决不可散列类型的类型错误？

Question

import numpy as np

A = np.array([1,2,1,2,1])
B = np.array([7,7,7,7.5,7.3])

input = ([A])
counter = dict()

for i in input:
    if i in counter:
        counter[i] =+1
    else:
        counter[i] = 1

sorted(counter.keys())
        
for k in sorted(counter.keys()):
    print((k, counter[k]))