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>>> import base64
>>> encoded = base64.b64encode(b'data to be encoded')
>>> encoded
b'ZGF0YSB0byBiZSBlbmNvZGVk'
>>> data = base64.b64decode(encoded)
>>> data
b'data to be encoded'

#类似的方法base64.encodebytes(s),这个方法返回多行数据(看不懂),反正末尾总是跟着\n