Methods of Python Tkinter Radiobutton widget

In this lesson we will study practically the methods that are associated with Python Tkinter Radiobutton wth code examples of these methods 

Here are some of the methods available for the Tkinter Radiobutton widget:

select(),

eselect(),

state(),

winfo_exists(),

invoke(),flash()

select()

The select() method is used to programmatically select a Radiobutton.

This sets the value of the variable associated with the Radiobutton to its own value.

import tkinter as tk
root = tk.Tk()
# create a variable to link the Radiobuttons together
var = tk.StringVar()

# create two Radiobuttons with the same variable
option_1 = tk.Radiobutton(root, text="Option 1", variable=var, value="option_1")
option_2 = tk.Radiobutton(root, text="Option 2", variable=var, value="option_2")

option_1.pack()
option_2.pack()

# select the first Radiobutton
option_1.select()

root.mainloop()

deselect()

The deselect() method is used to clear the selection of a Radiobutton.

This sets the value of the variable associated with the Radiobutton to None, if it is a StringVar, or to False, if it is a BooleanVar

import tkinter as tk

root = tk.Tk()

# create a variable to link the Radiobuttons together
var = tk.StringVar()

# create two Radiobuttons with the same variable
option_1 = tk.Radiobutton(root, text="Option 1", variable=var, value="option_1")
option_2 = tk.Radiobutton(root, text="Option 2", variable=var, value="option_2")

option_1.pack()
option_2.pack()

# clear the selection of the Radiobuttons
option_1.deselect()
option_2.deselect()

root.mainloop()

state()

The state() method is used to get or set the state of a Radiobutton. The state can be one of three values: “normal”, “disabled”, or “selected”

import tkinter as tk

root = tk.Tk()

# create a Radiobutton that will be disabled
option_1 = tk.Radiobutton(root, text="Option 1", state="disabled")

option_1.pack()

# get the state of the Radiobutton
state = option_1.state()
print(state)

# set the state of the Radiobutton to "selected"
option_1.state(["selected"])

root.mainloop()

winfo_exists()

The winfo_exists() method is used to determine whether a Radiobutton still exists in the application.

It returns True if the Radiobutton exists, and False if it has been destroyed.

import tkinter as tk

root = tk.Tk()

# create a Radiobutton that will be destroyed
option_1 = tk.Radiobutton(root, text="Option 1")

option_1.pack()

# check if the Radiobutton exists
exists_before = option_1.winfo_exists()
print(exists_before)

# destroy the Radiobutton
option_1.destroy()

# check if the Radiobutton exists again
exists_after = option_1.winfo_exists()
print(exists_after)

root.mainloop()

invoke()

The invoke() method is used to simulate a click on the Radiobutton.

This will cause the Radiobutton to become selected, and any associated command will be called.

import tkinter as tk
root = tk.Tk()
# create a variable to link the Radiobuttons together
var = tk.StringVar()

# create two Radiobuttons with the same variable
option_1 = tk.Radiobutton(root, text="Option 1", variable=var, value="option_1")
option_2 = tk.Radiobutton(root, text="Option 2", variable=var, value="option_2")

option_1.pack()
option_2.pack()

# simulate a click on the first Radiobutton
option_1.invoke()
root.mainloop()

flash()

The flash() method is used to flash the Radiobutton.

This will cause the Radiobutton to become temporarily highlighted.

import tkinter as tk
root = tk.Tk()
# create a variable to link the Radiobuttons together
var = tk.StringVar()
# create a Radiobutton
option_1 = tk.Radiobutton(root, text="Option 1", variable=var, value="option_1")
option_1.pack()
# flash the Radiobutton
option_1.flash()
root.mainloop()

Some of uses of Tkinter Radiobutton

Tkinter Radiobutton is a useful widget that allows the user to select a single option from a set of predefined options. It can be used in a variety of applications to provide a simple and intuitive way for the user to make a choice.

Some of the common uses of Tkinter Radiobutton are:

User preference settings: Radiobuttons can be used to provide the user with a list of options for configuring the preferences of an application. For example, an image editing program might use Radiobuttons to allow the user to select the default image format to save images in.

Survey and feedback forms: Radiobuttons can be used in survey forms to collect feedback from users. This can help to gather data on user preferences or opinions about certain topics.

Quiz and test applications: Radiobuttons can be used in quiz and test applications to provide the user with a set of multiple choice options to select from. This can help to create a more interactive and engaging learning experience.

Control panels: Radiobuttons can be used in control panels to provide the user with a set of options to control the behavior of a device or system. For example, a home automation system might use Radiobuttons to allow the user to select the lighting mode for a room.

In general, the Tkinter Radiobutton widget can be used in any application that requires the user to select a single option from a set of predefined options.

Examples

How to use Radiobutton tkinter to create Survey and feedback forms with code example

Here is an example of how to use the Tkinter Radiobutton widget to create a simple survey form:

import tkinter as tk

# create a new Tkinter window
root = tk.Tk()

# create a label for the survey question
question_label = tk.Label(root, text="How would you rate our service?")

# create a variable to store the user's response
response_var = tk.StringVar()

# create a set of Radiobuttons to collect the user's response
option_1 = tk.Radiobutton(root, text="Excellent", variable=response_var, value="excellent")
option_2 = tk.Radiobutton(root, text="Good", variable=response_var, value="good")
option_3 = tk.Radiobutton(root, text="Fair", variable=response_var, value="fair")
option_4 = tk.Radiobutton(root, text="Poor", variable=response_var, value="poor")

# create a submit button to record the user's response
submit_button = tk.Button(root, text="Submit", command=lambda: print(f"User response: {response_var.get()}"))

# pack the widgets into the window
question_label.pack()
option_1.pack()
option_2.pack()
option_3.pack()
option_4.pack()
submit_button.pack()

# run the main event loop
root.mainloop()

This code creates a survey form with a question asking the user to rate a service, and a set of four Radiobuttons for the user to select their response. When the user clicks the “Submit” button, their response is printed to the console.

You can modify this code to create different types of survey forms by changing the question and response options to suit your needs. You can also use other Tkinter widgets such as Labels and Entry boxes to create more complex survey forms that collect additional information from the user.

How to use Radiobutton tkinter to create Quiz and test applications with code example

Here is an example of how to use the Tkinter Radiobutton widget to create a simple quiz application:

import tkinter as tk
# create a new Tkinter window
root = tk.Tk()
# create a list of quiz questions and their corresponding answers
questions = [
    {"question": "What is the capital of France?", "answer": "Paris"},
    {"question": "What is the highest mountain in the world?", "answer": "Mount Everest"},
    {"question": "What is the largest continent?", "answer": "Asia"}
]

# create a variable to store the user's score
score = 0
# create a function to display the next quiz question
def next_question(question_num):
    global score
   
    # clear the window
    for widget in root.winfo_children():
        widget.destroy()
        
    # display the quiz question and answer options
    question_label = tk.Label(root, text=questions[question_num]["question"])
    option_1 = tk.Radiobutton(root, text="A. " + questions[question_num]["answer"], value=1)
    option_2 = tk.Radiobutton(root, text="B. " + "Wrong answer 1", value=2)
    option_3 = tk.Radiobutton(root, text="C. " + "Wrong answer 2", value=3)
    option_4 = tk.Radiobutton(root, text="D. " + "Wrong answer 3", value=4)
    submit_button = tk.Button(root, text="Submit", command=lambda: check_answer(question_num, option_1, option_2, option_3, option_4))
    
    question_label.pack()
    option_1.pack()
    option_2.pack()
    option_3.pack()
    option_4.pack()
    submit_button.pack()
    
# create a function to check the user's answer
def check_answer(question_num, option_1, option_2, option_3, option_4):
    global score
    
    # check if the user's answer is correct
    if option_1.winfo_ismapped():
        if option_1.var.get() == 1:
            score += 1
    elif option_2.winfo_ismapped():
        if option_2.var.get() == 1:
            pass
    elif option_3.winfo_ismapped():
        if option_3.var.get() == 1:
            pass
    elif option_4.winfo_ismapped():
        if option_4.var.get() == 1:
            pass
    
    # display the next question or the final score
    if question_num == len(questions) - 1:
        for widget in root.winfo_children():
            widget.destroy()
        score_label = tk.Label(root, text=f"Final score: {score}/{len(questions)}")
        score_label.pack()
    else:
        next_question(question_num + 1)

# display the first quiz question
next_question(0)

# run the main event loop
root.mainloop()

This code creates a quiz application with a set of three multiple-choice questions and their corresponding answers. Each question is displayed using a set of four Radiobuttons, and the user’s answer is checked when they click the “Submit” button. The user’s score is displayed at the end of the quiz.

You can modify this code to create different types of quiz applications by changing the questions and answer options to suit your needs. You can also use other Tkinter widgets such as Labels and Entry boxes to create more complex quiz applications that collect additional information from the user.

How to use  Radiobuttons to create Control panels

You can use the Tkinter Radiobutton widget to create control panels that allow the user to select various options. Here is an example of how to create a simple control panel using Radiobuttons:

import tkinter as tk
# create a new Tkinter window
root = tk.Tk()
# create a label for the control panel
label = tk.Label(root, text="Control Panel")
label.pack()
# create a variable to store the user's selection
selection = tk.StringVar()
# create a set of Radiobuttons to allow the user to select an option
option_1 = tk.Radiobutton(root, text="Option 1", variable=selection, value="option_1")
option_2 = tk.Radiobutton(root, text="Option 2", variable=selection, value="option_2")
option_3 = tk.Radiobutton(root, text="Option 3", variable=selection, value="option_3")
# pack the Radiobuttons into the window
option_1.pack()
option_2.pack()
option_3.pack()
# create a function to print the user's selection
def print_selection():
    print(selection.get())
# create a button to allow the user to submit their selection
submit_button = tk.Button(root, text="Submit", command=print_selection)
submit_button.pack()
# run the main event loop
root.mainloop()

This code creates a control panel with a label and a set of three Radiobuttons that allow the user to select an option. The user’s selection is stored in a StringVar variable, and a button is provided to allow the user to submit their selection. When the user clicks the button, the value of the StringVar variable is printed to the console.

You can modify this code to create more complex control panels with multiple sets of Radiobuttons and other Tkinter widgets such as Checkbuttons and Sliders. By using these widgets together, you can create powerful and intuitive control panels for a variety of applications.

A complete application by using this lesson

import tkinter as tk

class SurveyForm:
    def __init__(self, master):
        self.master = master
        master.title("Survey Form")
        
        # Create a label for the survey question
        self.question_label = tk.Label(master, text="What is your favorite color?")
        self.question_label.pack()
        
        # Create a variable to hold the selected answer
        self.answer_var = tk.StringVar()
        
        # Create the Radiobutton options
        self.option_red = tk.Radiobutton(master, text="Red", variable=self.answer_var, value="red")
        self.option_red.pack()
        self.option_blue = tk.Radiobutton(master, text="Blue", variable=self.answer_var, value="blue")
        self.option_blue.pack()
        self.option_green = tk.Radiobutton(master, text="Green", variable=self.answer_var, value="green")
        self.option_green.pack()
        
        # Create a button to submit the form
        self.submit_button = tk.Button(master, text="Submit", command=self.submit_form)
        self.submit_button.pack()
        
    def submit_form(self):
        # Retrieve the selected answer and display it in a message box
        answer = self.answer_var.get()
        message = f"Your favorite color is {answer}!"
        tk.messagebox.showinfo("Survey Result", message)

root = tk.Tk()
survey_form = SurveyForm(root)
root.mainloop()

This application creates a simple survey form with a question asking for the user’s favorite color. The user can select their answer from a set of Radiobutton options, and when they click the Submit button, a message box is displayed with their selected answer.

You can modify this application to include additional questions or customize it to fit your specific use case.

Quiz

1-What is the Tkinter Radiobutton widget used for?

1. To display images
2. To display text
3. To allow the user to select a single option from a set of options
4. To allow the user to enter text

Answer: c. To allow the user to select a single option from a set of options

2-What is the syntax to create a Tkinter Radiobutton?

1. Radiobutton()
2. tkinter.Radiobutton()
3. tk.Radiobutton()
4. tkinter.create_radiobutton()

Answer: c. tk.Radiobutton()

3-Which of the following is an option for the Tkinter Radiobutton?

1. font
2. color
3. width
4. height

Answer: a. font

4-What is the method used to get the selected value from a set of Radiobuttons?

1. get()
2. set()
3. value()
4. selected()

Answer: a. get()

5-What is an example of how to create a control panel with Radiobuttons?

1. A web page with a menu bar
2. A calculator with buttons
3. A form with text fields
4. A window with options to select

Answer: d. A window with options to select

6-Which of the following is a valid option for the Tkinter Radiobutton?

1. image
2. margin
3. padding
4. border

Answer: a. image

7-How can you group a set of Radiobuttons together so that only one can be selected at a time?

1. By giving them all the same color
2. By placing them in the same row or column
3. By giving them all the same variable name
4. By giving them all the same font

Answer: c. By giving them all the same variable name

8-What is an advantage of using Radiobuttons in a survey or feedback form?

1. They allow the user to enter free-form text
2. They are easier to use than other widgets
3. They allow the user to select from a set of predefined options
4. They are more visually appealing than other widgets

Answer: c. They allow the user to select from a set of predefined options

9-What is the method used to set the default value for a Radiobutton?

1. set()
2. get()
3. default()
4. value()

Answer: a. set()

10-How can you create a tooltip for a Radiobutton in Tkinter?

1. By adding a label widget next to the Radiobutton
2. By using the Message widget
3. By using the Tooltip widget
4. Tkinter does not support tooltips

Answer: b. By using the Message widget

11-What is the default value of a Tkinter Radiobutton?

1. 0
2. 1
3. None
4. an empty string

Answer: c. None

12-How can you create a disabled Tkinter Radiobutton?

1. By setting the state option to “disabled”
2. By using the disabled() method
3. By setting the disabled option to True
4. Tkinter Radiobuttons cannot be disabled

Answer: a. By setting the state option to “disabled”

13-How can you change the font of a Tkinter Radiobutton’s label?

1. By setting the font option
2. By using the config() method
3. By using the Label widget instead of the Radiobutton widget
4. By setting the textvariable option

Answer: a. By setting the font option

14-How can you create a vertical layout of Tkinter Radiobuttons?

1. By using the grid() method with columnspan option
2. By using the pack() method with side option
3. By using the place() method with y option
4. Tkinter Radiobuttons cannot be vertically oriented

Answer: b. By using the pack() method with side option

15-How can you limit the number of choices a user can select in a group of Tkinter Radiobuttons?

1. By using the limit option
2. By using the restrict option
3. By using the command option
4. Tkinter Radiobuttons cannot be limited in their selection

Answer: d. Tkinter Radiobuttons cannot be limited in their selection

16-What is the advantage of using the variable option in Tkinter Radiobuttons?

1. It allows you to set the default value of the Radiobutton.
2. It allows you to group a set of Radiobuttons together.
3. It allows you to disable the Radiobutton.
4. It allows you to change the font of the Radiobutton.

Answer: b. It allows you to group a set of Radiobuttons together.

17-How can you retrieve the selected value from a group of Tkinter Radiobuttons?

1. By using the get() method on the Radiobutton object.
2. By using the get() method on the parent window object.
3. By using the set() method on the Radiobutton object.
4. By using the set() method on the parent window object.

Answer: a. By using the get() method on the Radiobutton object.

18-How can you set a tooltip for a Tkinter Radiobutton?

1. By using the Tooltip widget.
2. By using the Label widget.
3. By using the Message widget.
4. Tkinter Radiobuttons do not support tooltips.

Answer: c. By using the Message widget.

19-How can you change the text of a Tkinter Radiobutton after it has been created?

1. By using the set() method on the Radiobutton object.
2. By using the configure() method on the Radiobutton object.
3. By using the text() method on the Radiobutton object.
4. By creating a new Radiobutton object with the new text.

Answer: b. By using the configure() method on the Radiobutton object.

20-How can you create a horizontal layout of Tkinter Radiobuttons?

1. By using the pack() method with the side option set to “left” or “right”.
2. By using the grid() method with the column option.
3. By using the place() method with the x option.
4. Tkinter Radiobuttons can only be vertically oriented.

Answer: a. By using the pack() method with the side option set to “left” or “right”.