[问题]为什么pyqt5中使用多继承时候会报错？ #60
Description
如问题所述，代码如下：
from threading import Thread
from time import sleep
from PyQt5.QtCore import QObject, pyqtSignal, QTimer, Qt
from PyQt5.QtWidgets import QWidget, QVBoxLayout, QProgressBar, QApplication
class A:
def __init__(self):
print('I am A')
class _Signals(A, QObject):
updateProgress = pyqtSignal(int)
def __init__(self):
super().__init__() #如果采用这种初始化方式就会报错：RuntimeError: super-class __init__() of type _Signals was never called
A.__init__(self)#如果采用这种初始化方式不会报任何错误，为什么呢？
QObject.__init__(self)
Signals = _Signals()
class UpdateThread(Thread):
def run(self):
self.i = 0
for i in range(101):
self.i += 1
Signals.updateProgress.emit(i)
# print(f'current value is: {i}')
sleep(1)
self.i = 0
Signals.updateProgress.emit(i)
class Window(QWidget):
def __init__(self, *args, **kwargs):
super(Window, self).__init__(*args, **kwargs)
self.resize(400, 400)
layout = QVBoxLayout(self)
self.progressBar = QProgressBar(self)
layout.addWidget(self.progressBar)
Signals.updateProgress.connect(
self.updatep, type=Qt.QueuedConnection)
QTimer.singleShot(2000, self.doStart)
def updatep(self, i):
self.progressBar.setValue(i)
QApplication.processEvents()
def doStart(self):
self.updateThread = UpdateThread(daemon=True)
self.updateThread.start()
if __name__ == '__main__':
import sys
from PyQt5.QtWidgets import QApplication
app = QApplication(sys.argv)
w = Window()
w.show()
sys.exit(app.exec_())