Tkinter Radio Button

There is a widget in Python GUI which allows the user to choose only one of a predefined set of exclusive options, that widget is known as Tkinter Radio Button. This widget offers a multiple-choice button. Many radio buttons can be used. By using the Tab key you can switch from one radionbutton to another.

Syntax:

The parameter, master represents the parent window and the options are used to set a various attributes as key-values separated by commas. The options are described below:

Options of Tkinker Radio Button:

bg: Background color behind the indicator and label.

fg: Color used to render the text.

font: Font used for the text.

padx: Amount of padding in terms of pixels

activeforeground: Foreground color when the mouse is over the radio button widget.

activebackground: Background color when the mouse is over the radio button widget.

command: When the state of this widget is changed, command procedure is called.

text: Label displayed next to the radio button. To display multiple lines of text it use newlines (“\n”).

highlightcolor: The text color when the widget is under focus.

pady: Tells the amount of padding in terms of pixels for the area around the widget.

selectcolor: Color of the radio button when it is set. By default it’s red.

Cursor: When the mouse is hovering over this widget, it can be changed to a special cursor type like an arrow or dot.

justify: This method specifies the text alignment within the widget. One of “left”, “center”, or “right”.

borderwidth: Size of the border around the indicator part itself. By default it’s 2 pixels.

image: Set this option to an image object to display a graphic image instead of text for this radio button.

state: By default state=NORMAL, but it can be set as state=DISABLED to gray out the control and make it unresponsive. If the cursor is currently over the radiobutton, the state is ACTIVE.

Methods of Tkinker Radio Button:

select(): This method turns on the radio button.

deselect():This method turns off the radio button.

invoke(): Through this method you can call the same actions that would occur if the user clicked on the radio button to change its state.

flash(): This method flashes the radio button a few times between its active and normal colors, but leaves it the way it started.

Example:

from tkinter import *

appWindow = Tk()
appWindow.title("Window Title-Tutorialsart.com")

appWindow.geometry('350x200')

radioB1 = Radiobutton(appWindow,text='1st', value=1)
radioB2 = Radiobutton(appWindow,text='2nd', value=2)
radioB3 = Radiobutton(appWindow,text='3rd', value=3)
radioB4 = Radiobutton(appWindow,text='4th', value=4)
radioB1.grid(column=0, row=0)
radioB2.grid(column=1, row=0)
radioB3.grid(column=2, row=0)
radioB4.grid(column=2, row=0)

appWindow.mainloop()

Output: