'ascii' codec can't decode byte 0x8b in position 6: ordinal not in range(128)

问题：

with open(filename, 'rb') as f:
----> 9     datadict = pickle.load(f)
     10     X = datadict['data']
     11     Y = datadict['labels']

UnicodeDecodeError: 'ascii' codec can't decode byte 0x8b in position 6: ordinal not in range(128)

解决办法：

with open(filename, 'rb') as f:
    datadict = pickle.load(f,encoding='iso-8859-1')
    X = datadict['data']
    Y = datadict['labels']

具体原因是为毛，后面再研究。先记录一下该问题。