[PyQt] What happend to PyQt5.QtCore.pyqtWrapperType?

[Phil Thompson]

On 9 Feb 2017, at 1:58 pm, Marcus Ottosson <konstruktion at gmail.com> wrote:
> 
> Hi Phil,
> 
> Do you have any recommendations for alternatives to pyqtWrapperType when it comes to metaclasses? I was using it to dynamically add signals to a QObject.
> 
> class PropertyType(QtCore.pyqtWrapperType):
> 
>     
> """Metaclass for converting class attributes into pyqtProperties"""
> 
> 
>     prefix = 
> "__pyqtproperty__"
> 
> 
>     
> def __new__(cls, name, bases, attrs):
> 
>         
> """Convert class properties into pyqtProperties"""
> 
> 
>         
> for key, value in
>  attrs.copy().items():
>             
> if key.startswith("__"
> ):
>                 
> continue
> 
> 
>             notify = QtCore.pyqtSignal()
> 
>             
> def set_data(key, value):
> 
>                 
> def set_data(self, value):
> 
>                     setattr(self, cls.prefix + key, value)
>                     getattr(self, key + 
> "Changed"
> ).emit()
>                     self.__datachanged__.emit(self)
>                 
> return
>  set_data
> 
>             attrs[key + 
> "Changed"
> ] = notify
>             attrs[key] = QtCore.pyqtProperty(
>                 type(value) 
> if value is not None else
>  QtCore.QVariant,
>                 fget=
> lambda self, k=key: getattr(self, cls.prefix + k, None
> ),
>                 fset=set_data(key, value),
>                 notify=notify)
> 
>         
> return
>  super(PropertyType, cls).__new__(cls, name, bases, attrs)
> 
> 
> class AbstractItem(QtCore.QObject):
> 
>     __metaclass__ = PropertyType
>     __datachanged__ = QtCore.pyqtSignal(QtCore.QObject)
> 
>     
> def __str__(self):
> 
>         
> return self.name
> 
> 
>     
> def __repr__(self):
> 
>         
> return "%s.%s(%r)"
>  % (__name__, type(self).__name__, self.__str__())
> 
> Using type in place of pyqtWrapperType results in a:
> 
> TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
> 
> Production code here.
> 
> Any ideas?
> 
> Thanks.

Have you tried doing what I suggest below?

Phil

> On 18 January 2017 at 22:17, Phil Thompson <phil at riverbankcomputing.com> wrote:
> On 18 Jan 2017, at 6:51 pm, Cody Scott <cody at perspexis.com> wrote:
> >
> > I'm looking at this code for inspiration on testing QML and I ran into this error.
> >
> > https://github.com/pyblish/pyblish-qml/blob/635c82d75fa5d5e294339bf8265f05eb5ca3b5d3/pyblish_qml/models.py#L94
> >
> > AttributeError: module 'PyQt5.QtCore' has no attribute 'pyqtWrapperType'
> >
> > It doesn't appear to be available in PyQt5==5.7.1
> >
> > It is available in PyQt5==5.6
> 
> It was an undocumented implementation detail that was removed as part of the adoption of the limited API.
> 
> If code wants to get the meta-type used by PyQt then it should call type() on a PyQt type object.
> 
> Phil