On 04/07/2013 18:00, Guido van Rossum wrote:
Thanks for the code pointers. So it's all about monkeypatching. :-)
Well, that's the testfixtures use case, but for mush it's about figuring
out whether you need to instantiate a class before calling a callable.
MyClass.a_method is a bit like a functools.partial in the mush case, if
I can pass that object around and know what to do with it (which I can
in Python 2) then I only have to pass that around.
In Python3, I either have to pass around the class, the method and a
flag to indicate that a class and method are being passed, or wrap my
own unboundmethod equivalent, meaning mush users would have to write
method(MyClass, 'a_method') under Python 3 when they can just write
MyClass.a_method under Python 2.
I
have only a little sympathy, as there still seems to be a way to do
this, it's just less convenient. Too bad.
I don't know that Victor's suggestion will actually work in all the
cases that MyClass.a_method.im_class does :-S
Chris
On Thu, Jul 4, 2013 at 9:42 AM, Chris Withers <ch...@simplistix.co.uk
Hi Guido,
I've bumped into this a couple of times.
First time was when I wanted to know whether what I had was a
classmethod, staticmethod or normal method here:
https://github.com/Simplistix/__testfixtures/blob/master/__testfixtures/replace.py#L59
<https://github.com/Simplistix/testfixtures/blob/master/testfixtures/replace.py#L59>
This resulted in having to trawl through __dict__ here:
https://github.com/Simplistix/__testfixtures/blob/master/__testfixtures/resolve.py#L17
<https://github.com/Simplistix/testfixtures/blob/master/testfixtures/resolve.py#L17>
...rather than just using getattr.
I bumped into it again, yesterday, trying to add support for classes
to this lightweight dependency injection framework I'm developing:
https://github.com/Simplistix/__mush/blob/master/tests/test___runner.py#L189
<https://github.com/Simplistix/mush/blob/master/tests/test_runner.py#L189>
Here's my local copy of that test:
https://gist.github.com/__cjw296/db64279c69cdc0c5e112
<https://gist.github.com/cjw296/db64279c69cdc0c5e112>
The workaround I was playing with this morning is a wrapper so that
I know I have a class method, although what I really want to write
at this line is:
https://gist.github.com/__cjw296/db64279c69cdc0c5e112#__file-gistfile1-txt-L40
<https://gist.github.com/cjw296/db64279c69cdc0c5e112#file-gistfile1-txt-L40>
runner = Runner(T0, C1.meth, C2.meth1, C2.meth2)
...but if I do that, how can the runner know that what it gets for
its second argument is a class method of C1?
(which is this case means that it should do C1().meth() rather than
C1.meth())
cheers,
Chris
On 04/07/2013 17:25, Guido van Rossum wrote:
Chris, what do you want to do with the knowledge you are seeking?
--Guido van Rossum (sent from Android phone)
On Jul 4, 2013 4:28 AM, "Chris Withers" <ch...@simplistix.co.uk
<mailto:ch...@simplistix.co.uk>
<mailto:ch...@simplistix.co.uk
<mailto:ch...@simplistix.co.uk>__>> wrote:
Hi All,
In Python 2, I can figure out whether I have a method or a
function,
and, more importantly, for an unbound method, I can figure
out what
class the method belongs to:
>>> class MyClass(object):
... def method(self): pass
...
>>> MyClass.method
<unbound method MyClass.method>
>>> MyClass.method.im_class
<class '__main__.MyClass'>
There doesn't appear to be any way in Python 3 to do this,
which is
a little surprising and frustrating...
What am I missing here?
Chris
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Simplistix - Content Management, Batch Processing & Python
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- http://www.simplistix.co.uk
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