Github user felixcheung commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/530#issuecomment-165284025
@cloverhearts thanks - to clarify the rule is two leading underscores
(`__foo`)
https://www.python.org/dev/peps/pep-0008/#method-names-and-instance-variables
"To avoid name clashes with subclasses, use two leading underscores to
invoke Python's name mangling rules. Python mangles these names with the class
name: if class Foo has an attribute named __a , it cannot be accessed by
Foo.__a"
you do not match both leading and trailing (`__foo__`)
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