Thanks 2QdxY4RzWzUUiLuE for your thoughtful response. I shouldn't have used the word "expression" since it was going to be taken as a Python term.
Let me clarify the issue. An optional starred expression (denoted "[starred_expression]" in the specification of the syntax) is a natural generalization of an expression list (which is not necessarily an expression in the Python sense) in the sense that use of the latter as a special case of the former will lead to intuitively expected results at all places where the former is allowed. The issue is these two things seem to be treated unnecessarily differently. Namely, the syntax requires an expression list at some places (not even optionally), but does not allow an optional starred expression at the same places. In such a place, one must turn an optional starred expression into an expression (in the Python sense) by putting parentheses around it while parentheses around an expression list are optional. This difference in treatment seemed unintuitive to me at least inside brackets. This means non-experts like me may need to take extra care to stay safe under possibility of confusion at those places. Must most non-experts be happy with this in your assessment? A solution would be simply not to exclude optional starred expressions where an expression list is required now (since it may be too late now to require a single expression at those places if that could be better). Best regards, Takuo _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@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/UVIJEMNOH75LJIVLFRWQSDTIYO2ZLBKX/ Code of Conduct: http://python.org/psf/codeofconduct/
