Github user sctincman commented on the issue:
https://github.com/apache/zeppelin/pull/2555
As it turns out, we do need to inherit from `object` in order to keep the
class a new-style python class in python 2. I had mistakenly thought
`StringIO.StringIO` was a new-style class, but turns out it is not.
There was another python2 problem I came across (`StringIO.StringIO` is
missing the `encoding` attribute, which was needed).
I had attempted to have `Logger` extend `TextIOWrapper`, but this caused a
lot of problems with python2's byte-based `str` class, and extending `BytesIO`
caused problems in python3 due to their unicode-based strings.
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