On Wed, 11 Aug 2021 11:59:11 -0300, Jack Brandom <jbran...@example.com> declaimed the following:
> >Where are these production rules coming from? They're not at > > https://docs.python.org/3/reference/grammar.html > >The word ``stride'' doesn't appear in this grammar. > Possibly from older versions of the grammar, before simplification to just <expression>. Originally, the "stride" term was added in response to requests from the numerical library developers (NumPy seems to be the survivor of that cluster). At the time, it wasn't envisioned to be usable with regular Python objects. https://en.wikipedia.org/wiki/Array_slicing#1991:_Python """ The stride syntax (nums[1:5:2]) was introduced in the second half of the 1990s, as a result of requests put forward by scientific users in the Python "matrix-SIG" (special interest group). """ As for the grammar... Would you prefer that from 2.7? trailer: '(' [arglist] ')' | '[' subscriptlist ']' | '.' NAME subscriptlist: subscript (',' subscript)* [','] subscript: '.' '.' '.' | test | [test] ':' [test] [sliceop] sliceop: ':' [test] test: or_test ['if' or_test 'else' test] | lambdef or_test: and_test ('or' and_test)* and_test: not_test ('and' not_test)* not_test: 'not' not_test | comparison -- Wulfraed Dennis Lee Bieber AF6VN wlfr...@ix.netcom.com http://wlfraed.microdiversity.freeddns.org/ -- https://mail.python.org/mailman/listinfo/python-list
