Github user bustios commented on the issue:
https://github.com/apache/zeppelin/pull/1352
Yes @bzz, I just deleted `if self.py3:` but not `img_str =
img_str.decode('ascii')` (it is in line 173), which means it will be executed
for both Python 2 and 3. Decoding bytes to string it necessary for Python 3
because that version makes distinction between String and Bytes, which does not
occur in Python 2.
Maybe, `img_str = img_str.decode('ascii')` should be in a separate line of
code to be clear.
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