Do we need _pyio at all? Does PyPy or any other Python implementation use it?
On Wed, Mar 31, 2021 at 9:36 PM Victor Stinner <[email protected]> wrote: > > Hi, > > The io module provides an open() function. It also provides an > OpenWrapper which only exists to be able to store open as a method > (class or instance method). In the _pyio module, pure Python > implementation of the io module, OpenWrapper is implemented as: > > class OpenWrapper: > """Wrapper for builtins.open > > Trick so that open won't become a bound method when stored > as a class variable (as dbm.dumb does). > > See initstdio() in Python/pylifecycle.c. > """ > def __new__(cls, *args, **kwargs): > return open(*args, **kwargs) > > I would like to remove this class which is causing troubles in the PEP > 597 implementation, but I don't know how. Simplified problem: > --- > def func(): > print("my func") > > class MyClass: > method = func > > func() # A > MyClass.method() # B > obj = MyClass() > obj.method() # C > --- > > With this syntax, A and B work, but C fails with TypeError: func() > takes 0 positional arguments but 1 was given. > > If I decorate func() with @staticmethod, B and C work, but A fails > with TypeError: 'staticmethod' object is not callable. > > Is OpenWrapper the only way to have a callable object which works in > the 3 variants A, B and C? > > A, B and C work if MyClass is modified to use staticmethod: > > class MyClass: > method = staticmethod(func) > > Victor > -- > Night gathers, and now my watch begins. It shall not end until my death. > _______________________________________________ > Python-Dev mailing list -- [email protected] > To unsubscribe send an email to [email protected] > https://mail.python.org/mailman3/lists/python-dev.python.org/ > Message archived at > https://mail.python.org/archives/list/[email protected]/message/QZ7SFW3IW3S2C5RMRJZOOUFSHHUINNME/ > Code of Conduct: http://python.org/psf/codeofconduct/ -- Inada Naoki <[email protected]> _______________________________________________ Python-Dev mailing list -- [email protected] To unsubscribe send an email to [email protected] https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/[email protected]/message/BOSZENKZRZCTIYWDRBRLWT4GKHWGDLWP/ Code of Conduct: http://python.org/psf/codeofconduct/