Member Avatar for pythonforlife

Sorry guys, how do you print a message dialog box if a file doesn't exists in python? I am currently using a program to do segmentation of video file and assembling it the files that I need and excluding those I don't. I have completed the tasks but if I randomly type a file that doesn't exists, it will print an error but what I want is a message Dialog box to appear, is there any way to do this?

Edited by pritaeas because: Moved.
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  • Latest Post Latest Post by vegaseat

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A couple of simple options will produce a user-friendly dialog instead of a console traceback when a filename is missing. As described, the problem is that the interpreter prints an error; the fix is to detect or handle the missing-file condition in code (as pointed toward) and then call a GUI toolkit’s error dialog (which echoes ’s hint about GUI frameworks).

Two common approaches: (1) check the path before attempting to open it, or (2) attempt the operation and catch the specific file-not-found exception. Both let the program show a short modal alert and then continue or abort cleanly. The example below uses the standard tkinter messagebox so it works without extra packages on most Python installs.

from pathlib import Path
import tkinter as tk
from tkinter import messagebox

file_path = Path('some_video_segment.mp4')

root = tk.Tk()
root.withdraw()   # keep the main window hidden

if not file_path.exists():
    messagebox.showerror('File not found', f'Could not find: {file_path}')
else:
    try:
        with file_path.open('rb') as fh:
            # process file...
            pass
    except Exception as e:
        messagebox.showerror('Read error', f'Error opening file:\n{e}')

root.destroy()

Practical notes: run GUI calls from the main thread (or marshal requests to the UI thread if processing in workers), and provide a non-GUI fallback (log to stderr or a log file) if the script may run headless. If using wxPython or Qt instead of tkinter, use their native dialogs (wx.MessageBox or QMessageBox) for a similar UX.

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Member Avatar for TrustyTony

Use try...except....else...finally

Member Avatar for vegaseat 
# error redirection=0 to console
# error redirection=1 to dialog window
app = wx.App(1)
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