Terry J. Reedy added the comment:

Has or will builtin classes be modified to follow advice to include a separate 
__bool__?  In 3.6.1,

>>> r = range(19**100)
>>> bool(r)
Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    bool(r)
OverflowError: Python int too large to convert to C ssize_t

----------
nosy: +serhiy.storchaka
versions: +Python 3.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15718>
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