Andrew Barnert via Python-ideas writes:
> On Apr 17, 2020, at 13:39, Alex Hall <alex.moj...@gmail.com> wrote:
> > { :a, "b": x, :c }
> >
> > { ::a, "b": x, ::c }
And now Lisp bites me, because '::a' means "the identifier 'a' in the
default namespace", which doesn't make sense in Python, because the
(similar) namespacing construct would be class attributes, while
Python has a more nuanced way of handling the current namespace.
I quite dislike the whole idea of abbreviating associations between
identifiers spelled the same way in different namespaces, both in dict
displays and in keyword arguments. It's really "grit on screen" level
notation.
I'd be happy to put aside my "dislike" if statistics on the frequency
of such duplicate names across namespaces were presented (and they're
compellingly large). I myself am rarely annoyed by this issue, with
the single exception of "self.foo = foo" in __init__() defs (which
can't be handled by these notations). It's usually the case for me
that the LHS of a keyword argument refers to the role of the
identifier in the function's computation, while the RHS refers to the
application domain, so I'd rarely get to use these optimizations
anyway. I guess I occasionally see dictionary displays of the form
"{'name' : name, 'address' : address, 'email' : email}" in my code,
but even that is pretty rare nowadays, as it generally gets spelled
fields = ('name', 'address', 'email')
[{k: v for k, v in zip(fields, next_tuple)} for next_tuple in input]
or something like that, which is less annoying to maintain when I
inevitably add fields. I used to have little dictbuilder functions
def add_record(db, name, address, email):
db.append({'name' : name, 'address' : address, 'email' : email})
all over the place, but then I learned about dict comprehensions and
zip got promoted to a builtin.
Steve
_______________________________________________
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/DLCTKCWZS2GCWXPU5JIMQMNIZ7F6HBFM/
Code of Conduct: http://python.org/psf/codeofconduct/
