use

[filkovsp]

Hi, may i propose an improvement to the Overload class?
Instead of using @signature("str"), i'd prefer using passing datatypes to the signature decorator: @signature(str).
This makes it possible to use this decorator for polymorphic classes, when we pass Parent Class type into signature decorator and want to accept inheriting child class as an argument's type.

Here is the improved version:
filkovsp/pythonlangutil/blob/master/pythonlangutil/overload.py

[Make42]

@filkovsp: There are a couple of other libs that do multiple dispatching like "multimethod" or "multipledispatch" and the single dispatcher iof the Python standard library can also be used for multiple dispatching. This library here does not seem to be actively developed.

[filkovsp]

Hi @Make42 ,
i'm heart broken to know that pythonlangutil isn't being developed any more. Most and huge advantage of your package over all other mentioned simgle/multi/ and other in-built decorators is that overload in pythonlangutil works properly with overloaded methods inside the class.

Here is the typical example when all other packages and decorators suck, but pythonlangutil works as a charm:

class MyClass:
    @Overload
    @signature(str)
    def method(s:str) -> None:
         # do smthng with a string

   @method.overload
   @signature(Iterable)
   def method(l:Iterable) ->:
        for s in l:
             self.method(s)

They all fail to properly deal with this line: self.method(s), except pythonlangutil.
There is only one little thing missing in pythonlangutil - ability to decorate static and classmethods
But i saw, someone has already tried to work it out in python3-overloadfn.

[Make42]

@filkovsp: There might be a misunderstanding. I am not a developer of pythonlangutil or in any way affiliated with pythonlangutil. I am just pointing out that - when you check https://github.com/ehsan-keshavarzian/pythonlangutil - the last commit is 2 years old. So I am just inferring from that pythonlangutil is not further developed. In fact, it only got 15 commits in total. Finally, it contains out of very little code.

But if pythonlangutil has been working for you until now, it might be working for you in the future as well.

[ehsan-keshavarzian]

Hi everyone, sorry for late response. As Make42 has mentioned this package is not being developed actively anymore but anyone would be welcome to fork this code and continue the development. Alternatively I can add you as a collaborator so you can continue development on this package.
Many thanks.