Creating type evaluation annotation

Thomas Jollans tjol at
Thu Dec 6 13:01:22 EST 2018

On 06/12/2018 11:48, Marek Mosiewicz wrote:
> I'm Java developer,but had some experience with Python based
> ERP software. It is quite serious application and I feel 
> unconfortable with not having type checking. I do not say language
> should be static, but having checking method signature
> is big win. For example in refactoring.

I get the feeling that you're essentially describing mypy.

> I know that Python 3 has possibility to have indicate
> type for varibale or param
> What could be great to have possibility to annotate any 
> class with what I call "type evaluator" function.
> That could check method signature with rules specific 
> for given type.
> The simplest evaluator would simply check if signature
> is same as method definition. 
> But it could go futher. It could check whatever is valid 
> logic for creating methods in given class and whatever 
> are valid params for given method.
> Even more powerful evaluator could be not only
> valid/not valid indicator. It could validate
> and suggest next param or method part name for given
> written part of call. That could make python IDEs
> much more powerful
> From my experience having signature checking and
> hinting params when writing code is really big win.
> I could simply refactor 100000 lines of code in
> Java, but same for Python is much more difficult
> Best regards,
>     Marek Mosiewicz

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