pyqt4 python中的MRO错误

我想继承widget1以使用其方法,但得到：

"TypeError: Error when calling the metaclass bases Cannot create a 
consistent method resolution order (MRO) for bases widget1, QWidget"

当我运行程序时.你能告诉我为什么会这样吗？

谢谢.

from PyQt4.QtGui import *
from PyQt4.QtCore import *
from PyQt4 import QtCore, QtGui
import sys

class widget1(QtGui.QWidget):
    def __init__(self):
        QtGui.QWidget.__init__(self)

class widget2(QtGui.QWidget, widget1):
    def __init__(self):
        QtGui.QWidget.__init__(self)


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    test = widget1()
    test.show()
    sys.exit(app.exec_()) 

解决方法:

Multiple Inheritance in PyQt4

It is not possible to define a new Python class that sub-classes from
more than one Qt class.

您可以使用多个替代设计决策,从而无需多个QObject继承.

从单父类简单继承

class widget1(QtGui.QWidget):
    def __init__(self):
        super(widget1, self).__init__()

    def foo(self): pass
    def bar(self): pass

class widget2(widget1):
    def __init__(self):
        super(widget2, self).__init__()

    def foo(self): print "foo"
    def baz(self): pass

组成

class widget2(QtGui.QWidget):
    def __init__(self):
        super(widget2, self).__init__()
        self.widget1 = widget1()

使其中一个类成为mixin类,而不是QObject：

class widget1(QtGui.QWidget):
    def __init__(self):
        super(widget1, self).__init__()

    def foo(self): print "foo"
    def bar(self): pass

class MixinClass(object):
    def someMethod(self):
        print "FOO"

class widget2(widget1, MixinClass):
    def __init__(self):
        super(widget2, self).__init__()

    def bar(self): self.foo()
    def baz(self): self.someMethod()

标签：pyqt4,python
来源： https://codeday.me/bug/20191201/2078351.html