* Dima Tisnek <dim...@gmail.com> [2015-04-30 13:41:53 +0200]: > # lambda > Not mentioned in the PEP, omitted for convenience or is there a rationale? > f = lambda x: None if x is None else str(x ** 2) > Current syntax seems to preclude annotation of `x` due to colon. > Current syntax sort of allows lamba return type annotation, but it's > easy to confuse with `f`.
Not sure if you'd really want to stuff type annotations into a lambda... at that point you'd IMHO be better off by using a real function. > # local variables > Not mentioned in the PEP > Non-trivial code could really use these. > > > # global variables > Not mentioned in the PEP > Module-level globals are part of API, annotation is welcome. > What is the syntax? > > > # comprehensions > [3 * x.data for x in foo if "bar" in x.type] > Arguable, perhaps annotation is only needed on `foo` here, but then > how complex comprehensions, e.g. below, the intermediate comprehension > could use an annotation > [xx foj y in [...] if ...] > > > # class attributes > s = socket.socket(...) > s.type, s.family, s.proto # int > s.fileno # callable > If annotations are only available for methods, it will lead to > Java-style explicit getters and setters. > Python language and data model prefers properties instead, thus > annotations are needed on attributes. > > > # plain data > user1 = dict(id=123, # always int > name="uuu", # always str > ...) # other fields possible > smth = [42, "xx", ...] > (why not namedtuple? b/c extensible, mutable) > At least one PHP IDE allows to annotate PDO. > Perhaps it's just bad taste in Python? Or is there a valid use-case? Most (all?) of this is actually mentioned in the PEP: https://www.python.org/dev/peps/pep-0484/#type-comments Florian -- http://www.the-compiler.org | m...@the-compiler.org (Mail/XMPP) GPG: 916E B0C8 FD55 A072 | http://the-compiler.org/pubkey.asc I love long mails! | http://email.is-not-s.ms/
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