I’ve always resisted changing this, but it keeps coming up, and in other
cases we don’t restrict the grammar (except when there are real
ambiguities). So maybe the SC can accept a PRP for this?
On Mon, Feb 3, 2020 at 15:47 Ben Avrahami <avrahami....@gmail.com> wrote:
> Hi all, decorators are a very powerful feature in python, but it's syntax
> is strangely restrictive.
>
> decorator ::= "@" dotted_name ["(" [argument_list [","]] ")"] NEWLINE
>
> for 99% of cases this is not a hindrance, but sometimes we'd rather be
> able to use full expression syntax. consider the following example (using
> PyQt):
>
> # make 10 buttons
> buttons = [QPushButton(f'button #{i}') for i in range(10)]
> # for now we only want to bind an event to the first button
> @buttons[0].clicked.connect
> def foo():
> ... # do whatever
>
> in cases such as this, it would be useful to have any expression
> acceptable as a decorator.
>
> In addition to other use cases such as chained function calling
> (@buttons_dict.get("foo"). clicked.connect), the restrictiveness of the
> decorator syntax seems like a strange oversight. Arbitrary expressions are
> already allowed in decorator lines as arguments, so allowing them as the
> called decorator shouldn't be too difficult.
>
> Any thoughts on this?
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