Use `tkinter.messagebox` for error messages

[gptgit]

In the Password_Generator_v1.1.0.py file, the tkMessageBox module is currently being used to display error messages. However, it is recommended to use the tkinter.messagebox module instead, which is the standard module for displaying message boxes in Tkinter.

Steps to Implement:

1. Replace the import statement for tkMessageBox with tkinter.messagebox.

# Replace this line
import tkMessageBox

# With this line
import tkinter.messagebox as messagebox

2. Modify the code that displays the error message to use the messagebox.showinfo() function instead of tkMessageBox.showinfo().

# Replace this line
tkMessageBox.showinfo("Error", "Please, Select at least 1 option!")

# With this line
messagebox.showinfo("Error", "Please select at least one option!")

Expected Behavior:
The code will use the standard tkinter.messagebox module to display error messages, providing a consistent and reliable approach for showing user notifications.

Benefits:

• Consistency: By using the tkinter.messagebox module, the code aligns with the standard practices for displaying message boxes in Tkinter applications.
• Compatibility: The tkinter.messagebox module is available in both Python 2 and Python 3, ensuring compatibility across different versions of Python.
• Future-proof: Since tkMessageBox is deprecated in newer versions of Python, using tkinter.messagebox ensures that the code will continue to work without any issues in future Python releases.

Implementing this proposal will improve the code's maintainability and compatibility while following the recommended practices for displaying error messages in Tkinter applications.