python MessageBox

The messagebox module in Tkinter is used to display various types of message dialogs. These dialogs can show information, warnings, errors, or ask for user confirmation. Here’s how you can use different messagebox functions:

Syntax:

messagebox.function_name(title, message [, options])

• function_name: The function to call (e.g., showinfo, showwarning).

• title: The title of the message box.

• message: The message to be displayed in the message box.

• options: Optional parameters such as default and parent.

Options:

1. default: Specifies the default button (ABORT, RETRY, or IGNORE).

2. parent: Specifies the parent window on top of which the message box is displayed.

Messagebox Functions:

1. showinfo(title, message):

Displays an informational message box.

Example:

from tkinter import messagebox

messagebox.showinfo("Information", "This is an info message.")

2. showwarning(title, message):

Displays a warning message box.

Example:

from tkinter import messagebox

messagebox.showwarning("Warning", "This is a warning message.")

3. showerror(title, message):

Displays an error message box.

Example:

from tkinter import messagebox

messagebox.showerror("Error", "This is an error message.")

4. askquestion(title, message):

Displays a question dialog with Yes and No buttons. Returns the response as a string ('yes' or 'no').

Example:

from tkinter import messagebox

response = messagebox.askquestion("Question", "Do you want to continue?")
if response == 'yes':
print("User chose Yes.")
else:
print("User chose No.")

5. askokcancel(title, message):

Displays a dialog with OK and Cancel buttons. Returns True if OK is clicked, False if Cancel is clicked.

Example:

from tkinter import messagebox

response = messagebox.askokcancel("Confirmation", "Do you want to save changes?")
if response:
print("User chose OK.")
else:
print("User chose Cancel.")

6. askyesno(title, message):

Displays a dialog with Yes and No buttons. Returns True if Yes is clicked, False if No is clicked.

from tkinter import messagebox

response = messagebox.askyesno("Confirm", "Are you sure you want to exit?")
if response:
print("User chose Yes.")
else:
print("User chose No.")

7. askretrycancel(title, message):

Displays a dialog with Retry and Cancel buttons. Returns True if Retry is clicked, False if Cancel is clicked.

from tkinter import messagebox

response = messagebox.askretrycancel("Retry", "Failed to connect. Retry?")
if response:
print("User chose Retry.")
else:
print("User chose Cancel.")

Example Usage in a Tkinter Application:

import tkinter as tk
from tkinter import messagebox

def show_info():
  messagebox.showinfo("Information", "This is an info message.")

def show_warning():
  messagebox.showwarning("Warning", "This is a warning message.")

def show_error():
  messagebox.showerror("Error", "This is an error message.")

def ask_question():
  response = messagebox.askquestion("Question", "Do you want to continue?")
  if response == 'yes':
    print("User chose Yes.")
  else:
    print("User chose No.")

def ask_ok_cancel():
  response = messagebox.askokcancel("Confirmation", "Do you want to save changes?")
  if response:
    print("User chose OK.")
  else:
    print("User chose Cancel.")

def ask_yes_no():
  response = messagebox.askyesno("Confirm", "Are you sure you want to exit?")
  if response:
    print("User chose Yes.")
  else:
    print("User chose No.")

def ask_retry_cancel():
  response = messagebox.askretrycancel("Retry", "Failed to connect. Retry?")
  if response:
    print("User chose Retry.")
  else:
    print("User chose Cancel.")

# Create main window
root = tk.Tk()
root.title("MessageBox Example")

# Create buttons to trigger message boxes
tk.Button(root, text="Show Info", command=show_info).pack(pady=5)
tk.Button(root, text="Show Warning", command=show_warning).pack(pady=5)
tk.Button(root, text="Show Error", command=show_error).pack(pady=5)
tk.Button(root, text="Ask Question", command=ask_question).pack(pady=5)
tk.Button(root, text="Ask OK/Cancel", command=ask_ok_cancel).pack(pady=5)
tk.Button(root, text="Ask Yes/No", command=ask_yes_no).pack(pady=5)
tk.Button(root, text="Ask Retry/Cancel", command=ask_retry_cancel).pack(pady=5)

# Run the Tkinter event loop
root.mainloop()