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Support for Qt Interfaces
=========================
PyQt5 does not, generally, support defining a class that inherits from more
than one Qt class. The exception is when inheriting from classes that Qt
defines as *interfaces*, for example
:class:`~PyQt5.QtGui.QTextObjectInterface`.
A Qt interface is an abstract class contains only pure virtual methods and is
used as a mixin with (normally) a :class:`~PyQt5.QtCore.QObject` sub-class. It
is often used to define the interface that a plugin must implement.
Note that PyQt5 does not need an equivalent of Qt's ``Q_INTERFACES`` macro in
order to use an interface class.
The ``textobject.py`` example includedd with PyQt5 demonstrates the use of an
interface.
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