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#QCheckBox#三种状态#未选中： 0#半选中： 1#选中： 2import sysfrom PyQt5.QtWidgets import *from PyQt5.QtCore import *from PyQt5.QtGui import *class QCheckboxDemo(QWidget):    def __init__(self):        super(QCheckboxDemo,self).__init__()        self.initUI()    def initUI(self):        self.setWindowTitle('复选框控件')        layout = QHBoxLayout()        self.checkBox1 = QCheckBox('复选框1')        self.checkBox1.setChecked(True)        self.checkBox1.stateChanged.connect(self.checkboxstate)        self.checkBox2 = QCheckBox('复选框2')        #self.checkBox2.setChecked(True)        self.checkBox2.stateChanged.connect(self.checkboxstate)        self.checkBox3 = QCheckBox('半选中')        self.checkBox3.setTristate(True)        self.checkBox3.setCheckState(Qt.PartiallyChecked)        self.checkBox3.stateChanged.connect(self.checkboxstate)        layout.addWidget(self.checkBox1)        layout.addWidget(self.checkBox2)        layout.addWidget(self.checkBox3)        self.setLayout(layout)    def checkboxstate(self):        sender = self.sender()        print(sender.text()+'ischecked='+str(sender.isChecked())+ 'state:'+ str(sender.checkState()))if __name__ == '__main__':    app =QApplication(sys.argv)    main = QCheckboxDemo()    main.show()    app.exit(app.exec_())

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