Ah, I get it—this is a common issue with Tkinter on Ubuntu! The default filedialog from Tkinter uses the old GTK2-style dialog, which looks totally out of place next to Ubuntu's modern GTK3 desktop. Let me show you two solid ways to get that native, up-to-date file picker instead:

This is the most robust approach since it directly uses the same GTK3 libraries that Ubuntu's desktop environment relies on. Here's how to set it up:

1. First, install the required dependencies via apt:

sudo apt-get install python3-gi python3-gi-cairo gir1.2-gtk-3.0

2. Then use this code to create a native directory picker:

from gi.repository import Gtk

def pick_directory():
    # Create the directory selection dialog
    dialog = Gtk.FileChooserDialog(
        title="Choose a Directory",
        action=Gtk.FileChooserAction.SELECT_FOLDER,
        buttons=(
            Gtk.STOCK_CANCEL, Gtk.ResponseType.CANCEL,
            Gtk.STOCK_OPEN, Gtk.ResponseType.OK
        )
    )
    # Set a reasonable default window size
    dialog.set_default_size(800, 600)
    
    # Run the dialog and get user response
    response = dialog.run()
    selected_dir = None
    if response == Gtk.ResponseType.OK:
        selected_dir = dialog.get_filename()
        print(f"Selected directory: {selected_dir}")
    
    # Clean up the dialog
    dialog.destroy()
    return selected_dir

if __name__ == "__main__":
    pick_directory()

This will pop up Ubuntu's native file dialog—complete with sidebar shortcuts, dark mode support, and all the modern UI elements you expect.

If you don't want to mess with GUI libraries, Zenity is a great alternative. It's a command-line tool that spawns native GTK dialogs, and it's pre-installed on most Ubuntu GNOME setups.

Here's the code to call it from Python:

import subprocess

def pick_directory_with_zenity():
    try:
        # Run Zenity's directory selection command
        result = subprocess.run(
            ["zenity", "--file-selection", "--directory", "--title=Select a Directory"],
            capture_output=True,
            text=True
        )
        
        if result.returncode == 0:
            # Strip the trailing newline from the output
            selected_dir = result.stdout.strip()
            print(f"Selected directory: {selected_dir}")
            return selected_dir
        else:
            print("User canceled the selection.")
            return None
    except FileNotFoundError:
        print("Zenity isn't installed! Install it with: sudo apt-get install zenity")
        return None

if __name__ == "__main__":
    pick_directory_with_zenity()

This is a lightweight option that gets the job done without needing to import heavy GUI frameworks.

内容的提问来源于stack exchange，提问作者RobbieZhao