steve at pearwood.info
Sun May 14 07:48:52 EDT 2017
On Sun, May 14, 2017 at 01:33:32PM +0200, Antoine Rozo wrote:
> Also, how do you handle special methods for operators, such as __add__?
Oh, that's a good point! I forgot about that.
For implementation-dependent reasons, you couldn't use this proposed new
syntax for dunder methods:
self = subclass(Parent)
self.my_method = my_method
self.__str__ = __str__
obj = MyClass()
obj.my_method(123) # okay
obj.__str__() # works, but bad style
str(obj) # doesn't work in CPython
Because of the implementation, str(obj) would NOT call __str__ in
CPython, although I think it would in IronPython. I'm not sure about
PyPy or Jython.
(CPython "new style classes" only call __dunder__ methods when they are
defined on the class, or a superclass, not when they are in the instance
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