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)

    #创建一个GroupBox组
    groupBox = QGroupBox("Checkboxes")
    groupBox.setFlat(False)

    #创建复选框1，并默认选中，当状态改变时信号触发事件
    self.checkBox1 = QCheckBox("&Checkbox1")
    self.checkBox1.setChecked(True)
    self.checkBox1.stateChanged.connect(lambda: self.btnstate(self.checkBox1))

    #创建复选框，标记状态改变时信号触发事件
    self.checkBox2 = QCheckBox("Checkbox2")
    self.checkBox2.toggled.connect(lambda: self.btnstate(self.checkBox2))

    #创建复选框3，设置为3状态，设置默认选中状态为半选状态，当状态改变时信号触发事件
    self.checkBox3 = QCheckBox("tristateBox")
    self.checkBox3.setTristate(True)
    self.checkBox3.setCheckState(Qt.PartiallyChecked)
    self.checkBox3.stateChanged.connect(lambda: self.btnstate(self.checkBox3))

    #水平布局
    layout = QHBoxLayout()
    #控件添加到水平布局中
    layout.addWidget(self.checkBox1)
    layout.addWidget(self.checkBox2)
    layout.addWidget(self.checkBox3)

    #设置QGroupBox组的布局方式
    groupBox.setLayout(layout)

    #设置主界面布局垂直布局
    mainLayout = QVBoxLayout()
    #QgroupBox的控件添加到主界面布局中
    mainLayout.addWidget(groupBox)

    #设置主界面布局
    self.setLayout(mainLayout)
    #设置主界面标题
    self.setWindowTitle("checkbox demo")

  #输出三个复选框当前的状态，0选中，1半选，2没选中
  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_())

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

self.checkBox1.stateChanged.connect(lambda: self.btnstate(self.checkBox1))
self.checkBox2.toggled.connect(lambda: self.btnstate(self.checkBox2))
self.checkBox3.stateChanged.connect(lambda: self.btnstate(self.checkBox3))

self.checkBox1 = QCheckBox("&Checkbox1")
self.checkBox1.setChecked(True)

chk1Status = self.checkBox1.text() + ", isChecked=" + str(self.checkBox1.isChecked()) + ', chekState=' + str(
      self.checkBox1.checkState()) + "\n"

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