new.instancemethod - how to port to Python3

[Helmut Jarausch]

On Sun, 07 Apr 2013 11:07:07 +0000, Steven D'Aprano wrote:

> On Sun, 07 Apr 2013 10:54:46 +0000, Helmut Jarausch wrote:
> 
>> class  Foo :
>>     ....
>>     def to_binary(self, *varargs, **keys):
>>        ....
>>        code= ...
>>        args= ...
>>        # Add function header
>>        code = 'def to_binary(self, %s):\n' % ', '.join(args) + code
>>        exec(code)
>>        self.to_binary = new.instancemethod(to_binary, self,
>>                                            self.__class__)
>>        return self.to_binary(*varargs, **keys)
> 
> 
> Self-modifying code! Yuck!
> 
> Nevertheless, try changing the line with new.instancemethod to this:
> 
>         self.to_binary = types.MethodType(to_binary, self)
> 
> 
> and see if it works. If it complains about the call to exec, then change 
> that part of the code to this:

Thanks, that worked
> 
>         ns = {}
>         exec(code, ns)
I just had to replace this with
          exec(code,globals(),ns)

>         to_binary = ns['to_binary']
>         self.to_binary = types.MethodType(to_binary, self)

Helmut