[Python-Dev] What's missing in PEP-484 (Type hints) (original) (raw)
Florian Bruhin me at the-compiler.org
Thu Apr 30 13:54:11 CEST 2015
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- Dima Tisnek <dimaqq at 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
xdue to colon. Current syntax sort of allows lamba return type annotation, but it's easy to confuse withf.
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
foohere, 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
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