CheckBox to a variables. PyQt5 - pyqt5

Question

How can I link checkbox to the variable under pushbutton?
The checkbox will return either 0 or 1 for the variable F which will affect the calculation output.
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(400, 394)
self.spinBox = QtWidgets.QSpinBox(Dialog)
self.spinBox.setGeometry(QtCore.QRect(60, 120, 48, 24))
self.spinBox.setObjectName("spinBox")
self.spinBox.setRange(1, 200)
self.spinBox.setValue(0)
self.checkBox = QtWidgets.QCheckBox(Dialog)
self.checkBox.setGeometry(QtCore.QRect(60, 160, 87, 20))
self.checkBox.setObjectName("checkBox")
self.pushButton = QtWidgets.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(50, 190, 113, 32))
self.pushButton.setObjectName("pushButton")
self.lcdNumber = QtWidgets.QLCDNumber(Dialog)
self.lcdNumber.setGeometry(QtCore.QRect(90, 230, 113, 32))
self.lcdNumber.setObjectName("lcdNumber")
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
self.pushButton.clicked.connect(self.pushButton_handler)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
self.checkBox.setText(_translate("Dialog", "CheckBox"))
self.pushButton.setText(_translate("Dialog", "PushButton"))
def pushButton_handler(self, state):
A1 = self.spinBox.value()
F= ??? #F to be equal to 0 if check box checked or 1 if
check box unchecked.
i=A1*F
app.processEvents()'
self.lcdNumber.display(i)

Answer 1

QCheckBox::stateChanged(int state)
This signal is emitted whenever the checkbox's state changes, i.e., whenever the user checks or unchecks it.
state contains the checkbox's new Qt::CheckState.
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.Qt import *
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(400, 394)
self.spinBox = QtWidgets.QSpinBox(Dialog)
self.spinBox.setGeometry(QtCore.QRect(60, 120, 48, 24))
self.spinBox.setObjectName("spinBox")
self.spinBox.setRange(1, 200)
self.spinBox.setValue(0)
self.checkBox = QtWidgets.QCheckBox(Dialog)
self.checkBox.setGeometry(QtCore.QRect(60, 160, 87, 20))
self.checkBox.setObjectName("checkBox")
self.pushButton = QtWidgets.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(50, 190, 113, 32))
self.pushButton.setObjectName("pushButton")
self.lcdNumber = QtWidgets.QLCDNumber(Dialog)
self.lcdNumber.setGeometry(QtCore.QRect(90, 230, 113, 32))
self.lcdNumber.setObjectName("lcdNumber")
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
self.pushButton.clicked.connect(self.pushButton_handler)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
self.checkBox.setText(_translate("Dialog", "CheckBox"))
self.pushButton.setText(_translate("Dialog", "PushButton"))
class Example(QtWidgets.QDialog, Ui_Dialog): # +
def __init__(self):
super(Example, self).__init__()
self.setupUi(self)
self.checkBox.stateChanged.connect(self.selectCheckBox) # +++
self.F = 1 # +
def pushButton_handler(self, state):
A1 = self.spinBox.value()
# F = #??? #F to be equal to 0 if check box checked or 1 if check box unchecked.
i = A1 * self.F
# ? app.processEvents()'
self.lcdNumber.display(i)
def selectCheckBox(self, toggle): # +++
if toggle == QtCore.Qt.Checked:
self.F = 0
else:
self.F = 1
if __name__ == "__main__":
app = QApplication(sys.argv)
default_font = QFont()
default_font.setPointSize(15)
app.setFont(default_font)
w = Example()
w.resize(220, 300)
w.show()
sys.exit(app.exec_())