Any six, with_metaclass and DeviceMeta example

Development Python
1

Hi all;
I’m porting some code to python 3 using six. One problem remain with de python devices trying to make use of six’s “with_metaclass”.
I tried the following:

class MyDevice(with_metaclass(DeviceMeta, Device)):

but got this error:

File ".../python2.7/site-packages/six-1.10.0-py2.7.egg/six.py", line 805, in with_metaclass
    class metaclass(meta):
TypeError: Error when calling the metaclass bases
    function() argument 1 must be code, not str

Whats’ wrong? I did the same with some of my own classes and it works perfectly.

Thanks.

2

Hi Nicolas,

In the pytango unit-tests, we’ve been successfully using six.add_metaclass:

@six.add_metaclass(DeviceMeta)
class MyDevice(Device):
   [...]

Does that work for you?

Also, defining the metaclass won’t be necessary any more after PR #90 is merged.

This change will become visible with pytango-9.2.1 release.

3

Hi Nicolas,

I confirm what Vincent says. He helped me with this as described in this issue:

I used both methods for python3 successfully - and I am a beginner ;-)!

Andy

4

Hi guys,

It does.

Thanks for your replies.