On 13/07/2022 14:14, o.jacob.nils...@gmail.com wrote:
Hi, I like this PEP but I couldn't find the motivation for using angle brackets
over square braces (brackets?). The survey in Appendix A is great but lacks any
conclusions. From that survey alone I would assume that angle brackets would
have been chosen over square braces, given that they are the most common option
and appear in (afaik) the more popular languages in that list. I think the PEP
should add a section about the choice of syntax in the rejected section, which
can be expanded upon in Appendix A.
If you can't tell I'm in favor of angle brackets, I think the examples given in
the PEP look a bit messy with so many parentheses and square braces in close
proximity. Using angle brackets would make the distinction between typevars and
function parameters clearer.
Another reason that square brackets should be preferred over angle
brackets is the difficulty in parsing:
list<list<int>>
is tokenised as list < list < int >> where the last token is a right
shift operator, so the parser has to know that sometimes >> is used when
two "angle bracket" groups are closed, instead of > >
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