Python 3.6 出现字符问题

 import pickle
def op (file):
    fo = open(file, 'rb')
    dict = pickle.load(fo)
    fo.close()
    return dict

path = r'D:\cifar_10_batches_py\test_batch'
xtr = op(path)
print(xtr)

错误：
line 9, in xtr = op(path)

line 4, in op dict = pickle.load(fo)

UnicodeDecodeError: 'ascii' codec can't decode byte 0x9e in position 0: ordinal not in range(128）

位置0在哪儿？

指定一下编码格式

 import pickle
train, test, dicts = pickle.load(open("./dataset/atis.pkl",  "rb"),  encoding='iso-8859-1')