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If the directory contains invalid filenames (invalid in the system 
charset), an exception is raised by os.path.join() used by 
shutil.rmtree():
 fullname = os.path.join(path, name)
 File "/home/haypo/prog/py3k/Lib/posixpath.py", line 64, in join
 if b.startswith('/'):
TypeError: expected an object with the buffer interface
name is an bytes object, not a str object. My system charset is utf-8.
Example to reproduce the problem:
 mkdir x
 # create a file with an invalid name
 touch -- $(echo -e 'x/--0250円--')
 python -c "import shutils; shutil.rmtree('x')"
=> TypeError: expected an object with the buffer interface