On Sun, 07 Apr 2013 09:50:35 +0000, Helmut Jarausch wrote:
> Hi,
>
> I'm trying to port a class to Python3.3 which contains
>
> class Foo :
> ....
> def to_binary(self, *varargs, **keys):
> ....
> ....
> self.to_binary = new.instancemethod(to_binary, self, self.__class__)
> # Finally call it manually
> return apply(self.to_binary, varargs, keys)
I do not understand this code. Can you give a short example that actually
works please?
As written, your code has a class that defines a to_binary method. Then,
*outside* of the method, in the class definition, you refer to "self",
and use a return statement. This is not possible -- self does not exist,
and return gives a SyntaxError.
But, if the indentation is wrong, it looks like you are trying to get the
to_binary method to replace itself with a global to_binary function. I do
not understand this.
> ----
>
> The last line has been transformed to
> return self.to_binary(*varargs, **keys)
>
> by 2to3
>
> But how to transform the line with new.instancemethod. I've seen
> examples where
> new.instancemethod(to_binary, ....)
> is replaced by to_binay
> but this doesn't work here since to_binary isn't known.
I cannot answer your question, because I don't understand it. But perhaps
this will help:
# === Python 2 version ===
class Spam:
pass
x = Spam()
def method(self, arg):
return {arg: self}
import new
x.method = new.instancemethod(method, x, x.__class__)
x.method("hello")
=> returns {'hello': <__main__.Spam instance at 0xa18bb4c>}
Here is the Python 3 version:
# === Python 3 ===
class Spam:
pass
x = Spam()
def method(self, arg):
return {arg: self}
import types
x.method = types.MethodType(method, x)
x.method("hello")
=> returns {'hello': <__main__.Spam object at 0xb7bc59ac>}
Does this help?
--
Steven
--
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