[issue35712] Make NotImplemented unusable in boolean context

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

One of the idioms for removing None no longer works:

>>> L = [0, 23, 234, 89, None, 0, 35, 9]
>>> list(filter(None.__ne__, L))
Warning (from warnings module):
  File "<pyshell#1>", line 1
DeprecationWarning: NotImplemented should not be used in a boolean context
[0, 23, 234, 89, 0, 35, 9]

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nosy: +rhettinger

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<https://bugs.python.org/issue35712>
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