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Question

I’m building a GUI to update a report, and currently I’m getting an error with tkinter library.

I tried add a function to check if the window still exists, but the error remains.

Here is the code:

import customtkinter

import datetime

import os

import shutil

import tkinter

System Settings

customtkinter.set_appearance_mode(“System”)

customtkinter.set_default_color_theme(“blue”)

Creates GUI frame with 720 width by 480 height

app = customtkinter.CTk()

app.geometry(“720×480”)

Function to center window on the screen

def center_window(window, width, height):

screen_width = window.winfo_screenwidth()

screen_height = window.winfo_screenheight()

x = (screen_width // 2) - (width // 2)

y = (screen_height // 2) - (height // 2)

window.geometry(f"{width}x{height}+{x}+{y}")

Center the main application window

center_window(app, 720, 480)

Sets the title of the main application window

app.title(“Finance Report”)

Creates a label for the date input box

title = customtkinter.CTkLabel(app, text=”Insert date (yyyymmdd)”)

title.pack(padx=10, pady=10)

Validation function for the date

def validate_date(date_str):

try:

    if len(date_str) != 8 or not date_str.isdigit():

        return False

    year = int(date_str[:4])

    month = int(date_str[4:6])

    day = int(date_str[6:])

    if month < 1 or month > 12:

        return False

    if month == 12:

        last_day = 31

    else:

        next_month = datetime.date(year, month + 1, 1)

        last_day = (next_month - datetime.timedelta(days=1)).day

    if day != last_day:

        return False

    return True

except Exception:

    return False

Function to show custom message boxes

def show_message(title, message, color):

message_box = customtkinter.CTkToplevel(app)

center_window(message_box, 300, 150)

message_box.title(title)

message_box.transient(app)  # Set to be on top of the main window

message_box.grab_set()  # Make the message box modal

label = customtkinter.CTkLabel(message_box, text=message)

label.pack(pady=20)

button = customtkinter.CTkButton(message_box, text="OK", command=message_box.destroy)

button.pack(pady=10)

label.configure(text_color=color)

# Focus handling

def check_and_set_focus():

    if message_box.winfo_exists():  # Check if window still exists

        message_box.focus_set()

message_box.after(200, check_and_set_focus)

Function to ask the user if they want to create the file and folder

def ask_create_file_and_folder(date_str):

def create():

    create_folder_and_file(date_str)

    message_box.destroy()



message_box = customtkinter.CTkToplevel(app)

center_window(message_box, 300, 150)

message_box.title("Create File and Folder")

message_box.transient(app)  # Set to be on top of the main window

message_box.grab_set()  # Make the message box modal

label = customtkinter.CTkLabel(message_box, text="File and folder do not exist.nDo you want to create them?")

label.pack(pady=20)

button_yes = customtkinter.CTkButton(message_box, text="Yes", command=create)

button_yes.pack(side="left", padx=10, pady=10)

button_no = customtkinter.CTkButton(message_box, text="No", command=message_box.destroy)

button_no.pack(side="right", padx=10, pady=10)

# Focus handling

def set_focus():

    if message_box.winfo_exists():

        message_box.focus_set()

message_box.after(200, set_focus)

Function to create the folder and copy the file from the previous month

def create_folder_and_file(date_str):

folder_path = f"Z:/../{date_str}"

os.makedirs(folder_path, exist_ok=True)

year = int(date_str[:4])

month = int(date_str[4:6])

if month == 1:

    previous_month = 12

    previous_year = year - 1

else:

    previous_month = month - 1

    previous_year = year



# Get the last day of the previous month

previous_last_day = (datetime.date(previous_year, previous_month, 1) + datetime.timedelta(days=32)).replace(

    day=1) - datetime.timedelta(days=1)

previous_last_day = previous_last_day.day



previous_date_str = f"{previous_year}{previous_month:02d}{previous_last_day:02d}"

previous_file_name = f"Finance_Report_{previous_date_str}.xlsx"

previous_file_path = f"Z:/…/{previous_date_str}/{previous_file_name}"

new_file_name = f"Finance_Report_{date_str}.xlsx"

new_file_path = os.path.join(folder_path, new_file_name)

shutil.copy(previous_file_path, new_file_path)

show_message("Success", f"File created:n{new_file_path}", "green")

Function to check file existence

def check_file_exists(date_str):

folder_path = f"Z:/…/{date_str}"

file_name = f"Finance_Report_{date_str}.xlsx"

file_path = os.path.join(folder_path, file_name)

return os.path.isfile(file_path)

Function to be called on button press

def submit_date():

date_str = date_var.get()

if validate_date(date_str):

    if check_file_exists(date_str):

        show_message("Success", f"File exists:n{date_str}/Finance_Report_{date_str}.xlsx", "green")

    else:

        ask_create_file_and_folder(date_str)

else:

    show_message("Error", "Invalid date.nPlease enter the last day of the monthnin yyyymmdd format.", "red")

Creates an input box to enter the date and binds it to date_var

date_var = customtkinter.StringVar()

date_entry = customtkinter.CTkEntry(app, textvariable=date_var)

date_entry.pack(padx=10, pady=10)

Creates a submit button that triggers the submit_date function when clicked

submit_button = customtkinter.CTkButton(app, text=”Submit”, command=submit_date)

submit_button.pack(padx=10, pady=10)

Runs the main loop of the application

app.mainloop()

Here is the error:

Exception in Tkinter callback

Traceback (most recent call last):

File “C:Users…AppDataLocalProgramsPythonPython312Libtkinter_init_.py”, line 1948, in call

return self.func(*args)



       ^^^^^^^^^^^^^^^^

File “C:Users…AppDataLocalProgramsPythonPython312Libtkinter_init_.py”, line 861, in callit

func(*args)

File “C:Users…AppDataLocalProgramsPythonPython312Libtkinter_init_.py”, line 787, in focus_set

self.tk.call('focus', self._w)

_tkinter.TclError: bad window path name “.!ctktoplevel”