[Python-Dev] Why wont duplicate methods be flagged as error (syntax or anything suitable error)

[Ivan Levkivskyi]

On 14 January 2018 at 08:20, Chris Angelico <rosuav at gmail.com> wrote:

> On Sun, Jan 14, 2018 at 7:10 PM, joannah nanjekye
> <nanjekyejoannah at gmail.com> wrote:
> > Hello,
> >
> > Apparently when you implement two methods with the same name:
> >
> > def sub(x, y):
> >      print(x -y)
> >
> > def sub(x, y):
> >      print(x -y)
> >
> > Even with type hints.
> >
> > def sub(x: int, y:int) -> int:
> >     return x - y
> >
> > def sub(x: float, y:float) -> float:
> >     return 8
> >
> > If you are from another background, you will expect the syntax with type
> > hints to act as though method overloading but instead last
> implementation is
> > always called. If this is the required behavior,then just flag any
> duplicate
> > method implementations as syntax errors.
> >
> > Is this sort of method name duplication important in any cases?
> >
> > Not aimed at criticism, just to understand.
>
> This is not an error in the language for the same reason that any
> other assignment isn't an error:
>
> x = 5
> x = 6
>
> But you will find that a number of linters will flag this as a
> warning. You can configure your editor to constantly run a linter and
> show you when something's wrong.
>

For example mypy (and probably also PyCharm) warn about
variable/function/class re-definition.

--
Ivan
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20180114/f2f51833/attachment.html>