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File "/usr/lib64/python3.4/codecs.py", line 490, in read
 data = self.bytebuffer + newdata
TypeError: can't concat bytes to NoneType
 if size < 0:
 newdata = self.stream.read()
 else:
 newdata = self.stream.read(size)
 # decode bytes (those remaining from the last call included)
 data = self.bytebuffer + newdata
if self.stream is nonblocking, it's read will return None (py3, py2 raises IOError(EGAIN)).
Simple `if newdata is None: return None` should fix that I guess