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.ben@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? _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-leave@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/WOWD4P... Code of Conduct: http://python.org/psf/codeofconduct/
-- --Guido (mobile)