On 2020-07-12 23:20, Guido van Rossum wrote:
[snip]
The need for a wildcard pattern has already been explained -- we really
want to disallow `Point(x, y, y)` but we really need to allow `Point(z,
_, _)`. Generating code to assign the value to `_` seems odd given the
clear intent to *ignore* the value.
Using `?` as the wildcard has mostly disadvantages: it requires changes
to the tokenizer, it could conflict with other future uses of `?` (it's
been proposed for type annotations as a shorter version of Optional, and
there's PEP 505, which I think isn't quite dead yet), and Python users
have no pre-existing intuition for its meaning.
FWIW, I don't think this use of '?' would conflict with the other
suggested uses because this use would be initial in an expression,
whereas the other uses would be non-initial.
[snip]
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