Eryk Sun added the comment:

In Python 3, gzip.open(filename, "rt") returns a TextIOWrapper using the 
system's default encoding. The decoded output is potentially very different 
from the byte string returned by 'text mode' in Python 2, even if using "rt" 
mode didn't result in the nonsensical "rtb" mode. I suggest using the default 
binary mode, and manually wrapping the file in an io.TextIOWrapper.

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nosy: +eryksun

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<http://bugs.python.org/issue30012>
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