Dan Snider <mr.assume.a...@gmail.com> added the comment:
So I also just happened to notice that the "documentation is wrong" for list,
tuple, and collections.deque. They use use _PyEval_SliceIndexNotNone whch
causes this:
>>> s = 'abcde'
>>> s.index('d', 0, None)
3
>>> [*s].index('d', None)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
[*s].index('d', None)
TypeError: slice indices must be integers or have an __index__ method
In 3.6.0, that error message is:
TypeError: slice indices must be integers or None or have an __index__
method
which means someone else was aware of this behavior and switched from
_PyEval_SliceIndex to _PyEval_SliceIndexNotNone but didn't think these
inconsistencies were inappropriate?
Anyway, I'll go ahead fix the docs later for accuracy's sake, but I'd much
rather update operator.indexOf to use a new abstract api function:
"PySequence_IndexOf" or some such, which is also capable of handling starting
from the tail like str.rindex.
If that's something that could be done, after I finish the Python prototype of
this sequence ChainMap analog and rewrite it in C, I'll have made my own
abstract sequence index function which I'd happily share.
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<https://bugs.python.org/issue34848>
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