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I ran into a related issue with the gettarinfo() method. Would that fall under the scope of this bug, or should I raise a separate one?
>>> with tarfile.open("/dev/null", "w") as tar:
... with open(b"/bin/sh", "rb") as file:
... tar.gettarinfo(fileobj=file)
... 
Traceback (most recent call last):
 File "<stdin>", line 3, in <module>
 File "/usr/lib/python3.4/tarfile.py", line 1768, in gettarinfo
 arcname = arcname.replace(os.sep, "/")
TypeError: expected bytes, bytearray or buffer compatible object
I realise that making TarInfo object with a byte string or integer as a file name is not a good idea. Perhaps the documentation should explicitly say that "fileobj.name" must be a real unencoded file name string unless "arcname" is also given. In my particular case I added arcname="", because my code generates the proper file name later on.