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From: Antoon Pardon <antoon.pardon@rece.vub.ac.be>
Newsgroups: comp.lang.python
Subject: Re: Case Statements
Date: Thu, 17 Mar 2016 10:23:23 +0100
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Xref: csiph.com comp.lang.python:105079

Op 17-03-16 om 03:02 schreef Chris Angelico:
> On Thu, Mar 17, 2016 at 12:54 PM, Steven D'Aprano <steve@pearwood.info> wrote:
>
>> I wouldn't want to rely on it working with decorator syntax either. Even if
>> it does now, I'm not sure that's a language guarantee.
> That's the thing, though. It's not a guarantee, yet it does work in
> every Python interpreter that I tried it in.

That depends on what you mean by work. This failes:

def monkeypatch(cls):
    orig = globals()[cls.__name__]
    print("Monkeypatch",id(cls),"into",id(orig))
    for attr in dir(cls):
        if not attr.startswith("_"):
            setattr(orig,attr,getattr(cls,attr))
    return orig

def main():
	class Foo:
		def method1(self):
			print("I am method 1")

	print("Foo is currently",id(Foo))
	some_object = Foo()

	@monkeypatch
	class Foo:
		def method2(self):
			print("I am method 2")

	print("Foo is now",id(Foo))

	some_object.method1()
	some_object.method2()

main()