UnicodeDecodeError: 'ascii' codec cannot decode byte 0x8b

I am using the following code here (with minor modifications):

import _pickle as cPickle 

def unpickle(file):
    fo = open(file, 'rb')
    dict = cPickle.load(fo)
    fo.close()
    return dict

unpickle('data_batch_1')

      

        
        
        
      

    

When I run the code, I get the following if I use Python 3.5.2

:

Traceback (most recent call last):
  File "open_batch.py", line 10, in <module>
    unpickle('data_batch_1')
  File "open_batch.py", line 5, in unpickle
    dict = cPickle.load(fo)
UnicodeDecodeError: 'ascii' codec can't decode byte 0x8b in position 6: ordinal not in range(128)

      

        
        
        
      

    

How can I fix this problem?

Thank.