Improve message if user forgot to call a function

Forgetting to call a method, i.e. missing (), is a somewhat common programming error. Mypy will typically catch this error, but often error messages includes something like "Callable[...]" has no attribute "foo". Since the callable type may be pretty complicated, this can look confusing.

Here are a few ideas that could make this better:

1. Only say Callable object has no attribute "foo" (omit the full callable type).
2. Add a note such as Did you mean ".foo()" (with parentheses)? (needs wordsmithing).
3. In addition to (1), show the signature of the function in a separate note pretty-printed using function definition syntax such as def foo() -> List[X].

Aucun fichier ni test n'est nommé. Commencez par localiser le chemin de diagnostic de mypy pour un objet Callable signalé comme n'ayant pas d'attribut, puis comparez les options proposées pour la formulation et la note de signature. C'est terminé lorsque le type Callable déroutant est présenté plus clairement et que la couverture de régression vérifie l'indication concernant les parenthèses manquantes.