How to assign a value to a radiobutton in pyqt?

Question

I want to assign a value to a radiobutton when it is checked.

def radiobutton8(self):
    if self.radioButton_8.isChecked():
        self.radioButton_8 = 02

However, this cannot work. Any solution?

UPDATE: My code has been edited to be:

class MyRadioButton(QtGui.QRadioButton):
    def __init__(self):
        super(MyRadioButton, self).__init__()
        self.value = None

    def SetValue(self, val):
        self.value = val

    def GetValue(self):
        return self.value

class UserTool(QtGui.QDialog):
    def setup(self, Dialog):
                          ...
        self.radioButton_8.toggled.connect(self.radiobutton8)

    def retranslateUi(self, Dialog):
                          ...
        self.radioButton_8 = MyRadioButton()
        self.radioButton_8.setText(_translate("Dialog", "A1", None))

def radiobutton8(self):
    if self.radioButton_8.isChecked():
        value = self.radioButton_8.setValue("02")
        self.lcdNumber.display(value)

However, my original text 'A1' for the radio button is now missing and my number still does not appear on my lcd when checked. Any idea why?

UPDATE: I edited my code to be something like that:

class MyRadioButton(QtGui.QRadioButton):
    def __init__(self):
        super(MyRadioButton, self).__init__()
        self.value = None

    def SetValue(self, val):
        self.value = val

    def GetValue(self):
        return self.value

class UserTool(QtGui.QDialog):
    def setup(self, Dialog):
                  ...
        self.lcdNumber = QtGui.QLCDNumber(Dialog)
        self.lcdNumber.setGeometry(QtCore.QRect(590, 10, 71, 23))
        self.lcdNumber.setFrameShadow(QtGui.QFrame.Raised)
        self.lcdNumber.setObjectName(_fromUtf8("lcdNumber"))
        self.lcdNumber.setStyleSheet("* {background-color: black; color: white;}")
        self.lcdNumber.display('00')

        self.radioButton_8 = QtGui.QRadioButton(Dialog)
        self.radioButton_8.setGeometry(QtCore.QRect(460, 10, 82, 17))
        self.radioButton_8.setChecked(False)
        self.radioButton_8.setAutoExclusive(False)
        self.radioButton_8.setObjectName(_fromUtf8("radioButton_8")) 
        self.radioButton_8 = MyRadioButton()
        self.radioButton_8.setText("A1")
        self.radioButton_8.setValue(02)
        self.radioButton_8.toggled.connect(self.showValueFromRadioButtonToLCDNumber)

    def showValueFromRadioButtonToLCDNumber(self):
        value = self.radioButton_8.GetValue()
        if self.radioButton_8.isChecked():
            self.lcdNumber.display(value)

And then now I have this error:

Traceback (most recent call last):
  File "C:/Users/Vivien Phua/Documents/Python Scripts/Rs232.py", line 303, in handleOpenWidget
    self.popup = UserTool()
  File "C:/Users/Vivien Phua/Documents/Python Scripts/Rs232.py", line 39, in __init__
    self.setup(self)
  File "C:/Users/Vivien Phua/Documents/Python Scripts/Rs232.py", line 153, in setup
    self.radioButton_8.setValue(02)
AttributeError: 'MyRadioButton' object has no attribute 'setValue'

I have also tried the code you have given me and there is no such error, but the LCD in your code does not show the value 02.

For your second UPDATE error: it is suppose to be SetValue, not setValue. Code I gave you shows 2, if you want it to show 02 set that value as string: `self.radioButton_8.SetValue("02")` instead of `self.radioButton_8.SetValue(02)` . I've updated that in my answer in EDIT2, but if you take a look I've also mentioned it in EDIT1 — Aleksandar, Jul 17 '14 at 08:40
I tried to run your code in EDIT2 and made sure it is self.radioButton.SetValue("02") but it still doesn't work. Nothing happens when I checked the radio button. — Viv91, Jul 18 '14 at 02:21
Oh it worked! I deleted this line `self.pushButton_7.clicked.connect(self.showValueFromRadioButtonToLCDNumber)` and added `self.radioButton.toggled.connect(self.showValueFromRadioButtonToLCDNumber)` and it worked. However is there anyway way to revert the LCD display if radio button is checked then unchecked? — Viv91, Jul 18 '14 at 03:02
showValueFromRadioButtonToLCDNumber will be called every time you check or uncheck radiobutton. So you can set LCD if self.radioButton_8.isChecked() and revert it otherwise. You can simply clear it or you will need some logic to save previous value of LCD if you want to show previous value. — Aleksandar, Jul 18 '14 at 06:24
No need to create a new class here. It is Python! Just add a new attribute to your radiobutton. `self.radioButton_8.myvalue = 123` — buhtz, Jul 20 '23 at 19:22

Aleksandar · Accepted Answer · 2014-07-17T08:54:12.800

Do you mean text value next to radioButton? if so, here is solution:

def radiobutton8(self):
    if self.radioButton_8.isChecked():
        self.radioButton_8.setText("02")

EDIT1: radioButton doesn't have value field as you need. However, you can write your own radiobButton class that inherits original QRadioButton, and add that field. Example:

class MyRadioButton(QtGui.QRadioButton):
    def __init__(self):
        super(MyRadioButton, self).__init__()
        self.value = None

    def SetValue(self, val):
        self.value = val

    def GetValue(self):
        return self.value

and use it like this:

self.radioButton_8 = MyRadioButton()
self.radioButton_8.setText("some text")
...
def radiobutton8(self):
    if self.radioButton_8.isChecked():
        self.radioButton_8.SetValue("02")# or .SetValue(2) if you want it to be integer

EDIT2

# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import Qt

class MyRadioButton(QtGui.QRadioButton):
    def __init__(self):
        super(MyRadioButton, self).__init__()
        self.value = None

    def SetValue(self, val):
        self.value = val

    def GetValue(self):
        return self.value

class Widget(QtGui.QWidget):
    def __init__(self):
        super(Widget, self).__init__()
        self.layout = QtGui.QVBoxLayout(self)

        self.pushButton_7 = QtGui.QPushButton("if RB is checked, show it's value to LCD")
        self.pushButton_7.setGeometry(QtCore.QRect(220, 650, 75, 23))
        self.pushButton_7.clicked.connect(self.showValueFromRadioButtonToLCDNumber)

        self.radioButton = MyRadioButton()
        self.radioButton.setText("some text")
        self.radioButton.SetValue("02")# somewhere in code first set value to radio button

        self.lcdNumber = QtGui.QLCDNumber()

        self.layout.addWidget(self.pushButton_7)
        self.layout.addWidget(self.radioButton)
        self.layout.addWidget(self.lcdNumber)

    def showValueFromRadioButtonToLCDNumber(self):
        value = self.radioButton.GetValue()
        if self.radioButton.isChecked():
            self.lcdNumber.display(value)

if __name__ == '__main__':
    app = QtGui.QApplication([])
    w = Widget()
    w.show()
    sys.exit(app.exec_())

No, what I mean is I want to add a value to the radio button like a function. I want the value to appear on LcdNumber widget to show the number '02' when I check the radio button. Any solution for this? — Viv91, Jul 16 '14 at 09:51
first you need to set value of radio button in order to read it with `GetValue()`. Take a look at working example in **EDIT2** in my answer. As for setText, I don't know what your `_translate` method do — Aleksandar, Jul 17 '14 at 07:11
The _translate is just a command generated by PyQt4 when i generated the Python script after dragging and dropping the widgets on my UI. I tried your suggestion but there is no need for a pushbutton. Instead, I edited mine to become like this shown above. — Viv91, Jul 17 '14 at 07:47
setText method needs string (QString) as input parametar, so ensure that _translate returns that type — Aleksandar, Jul 17 '14 at 08:46

How to assign a value to a radiobutton in pyqt?

1 Answers1