Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:
Sorry, I don't understand your demonstration. What's the mystery ``parser``
object with an ``expr`` method? What is it doing?
Your comment says "all binary/unary number ops work" but I don't know what you
mean by "work". Could you show some plain, vanilla Python code that
demonstrates the problem?
>From your description here:
> an unparenthesized comparison expression cannot be unpacked using
> the *iterable "unpack" operator
it sounds like you are talking about an operator precedence issue. Am I close?
But I think you are wrong:
py> print(*[] < [1, 2])
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: print() argument after * must be an iterable, not bool
suggests that the < operator is evaluated before trying to unpack.
Let's try with something else:
class X:
def __lt__(self, other):
return [1, 2, 3]
py> print(*X() < None)
1 2 3
Perhaps I have misunderstood something.
----------
nosy: +steven.daprano
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36617>
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