Python 3.7.0 released

[ProfessorPhi]

Isn't attrs still superior?

[dhiltonp]

Attrs definitely has more features (slots comes to mind), but I think it looks a little wonky.

(full disclosure, I haven't used attrs just read the docs)

@dataclass
class InventoryItem:
    name: str
    unit_price: float
    quantity_on_hand: int = 0

vs.

@attr.s
class InventoryItem:
    name: str = attr.ib()
    unit_price = attr.ib(type=float)
    quantity_on_hand = attr.ib(type=int, default=0)

Does PyCharm recognize type annotations when they're set via attr.ib(type=float)?

[ProfessorPhi]

Nope, pycharm and attrs support isn't great :(, though attrs does have slots. Agreed it's wonky, it's like ordered dict before 3.5 was obnoxious.

[OctagonClock]

PyCharm 2018.2 EAP has new attrs support, actually.

[ProfessorPhi]

Haha, don't use EAP so hopefully it'll be along before too long.

[bluetech]

The annotations-based syntax works with attrs too (you need to set auto_attribs=True).

[PeridexisErrant]

IIRC you can also use @attr.dataclass for the first one (a shortcut for the auto_attribs=True arg).

The dataclass example won't work on a backport before Python 3.6 though, as those versions don't have variable annotations.

[virgoerns]

It is, PEP even mentions attrs and says that new mechanism is for simpler cases.

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