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Howdy!
I encountered this error when accidently passing in mixed types to reldir
>>> import os
>>> os.path.relpath('/Users/bachmann', b'.')
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/usr/local/Cellar/python3/3.4.1/Frameworks/Python.framework/Versions/3.4/lib/python3.4/posixpath.py", line 451, in relpath
 start_list = [x for x in abspath(start).split(sep) if x]
TypeError: Type str doesn't support the buffer API
When this mistake is done in join we get a helpful error message.
I simply borrowed this logic and put in in relpath. Is this useful?