On Mon, Jun 10, 2019 at 02:29:56PM -0700, Ethan Furman wrote:
> Greetings!
>
> I saw my first annotation mix-up with regards to Enum today:
[...]
I don't think this is particular to Enums. I think this is going to be a
stumbling block for any class.
py> class X:
... a: 1
... b: 2
...
py> X.__annotations__
{'a': 1, 'b': 2}
py> X.a
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AttributeError: type object 'X' has no attribute 'a'
Even after 20 years, I occassionally mix up a:1 and a=1 syntax in dicts.
It doesn't matter there, because its a syntax error. If I wrote more
class attributes, I'd probably make this error occassionally too.
I think this is going to especially bite beginners, who tend to write
more class attributes. (Especially those coming from other languages,
where instance attributes are declared at class level.)
--
Steven
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