Re: [Python-ideas] JavaScript-Style Object Creation in Python (using a constructor function instead of a class to create objects)
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:
def MyClass(): self = subclass(Parent)
def my_method(arg):
...
self.my_method = my_method
def __str__():
...
self.__str__ = __str__
return self
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 __dict__.)
-- Steve