PyQt基础_006_ 按钮类控件QCheckBox

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import Qt

class CheckBoxDemo(QWidget):

    def __init__(self, parent=None):
        super(CheckBoxDemo , self).__init__(parent)

        groupBox = QGroupBox("Checkboxes")
        groupBox.setFlat( False )

        layout = QHBoxLayout()
        self.checkBox1= QCheckBox("&Checkbox1")
        self.checkBox1.setChecked(True)
        self.checkBox1.stateChanged.connect( lambda:self.btnstate(self.checkBox1) )
        layout.addWidget(self.checkBox1)

        self.checkBox2 = QCheckBox("Checkbox2")
        self.checkBox2.toggled.connect( lambda:self.btnstate(self.checkBox2) )
        layout.addWidget(self.checkBox2)

        self.checkBox3 = QCheckBox("tristateBox")
        self.checkBox3.setTristate(True)
        self.checkBox3.setCheckState(Qt.PartiallyChecked ) 
        self.checkBox3.stateChanged.connect( lambda:self.btnstate(self.checkBox3) )
        layout.addWidget(self.checkBox3)

        groupBox.setLayout(layout)
        mainLayout = QVBoxLayout()
        mainLayout.addWidget(groupBox)

        self.setLayout(mainLayout)
        self.setWindowTitle("checkbox demo")

    def btnstate(self,btn ):
        chk1Status = self.checkBox1.text()+", isChecked="+ str( self.checkBox1.isChecked() ) + ', chekState=' + str(self.checkBox1.checkState())  +"\n" 
        chk2Status = self.checkBox2.text()+", isChecked="+ str( self.checkBox2.isChecked() ) + ', checkState=' + str(self.checkBox2.checkState())  +"\n" 
        chk3Status = self.checkBox3.text()+", isChecked="+ str( self.checkBox3.isChecked() ) + ', checkState=' + str(self.checkBox3.checkState())  +"\n" 
        print(chk1Status + chk2Status + chk3Status )

if __name__ == '__main__':
    app = QApplication(sys.argv)
    checkboxDemo = CheckBoxDemo()
    checkboxDemo.show()
    sys.exit(app.exec_())