Develop Reference

Removing Base Window When Using Tkinter Python 3 (Askopenfiledialogue)

This is my first post on here, so bear with me as far as post etiquette goes. I've been struggling to get rid of the base Tkinter window that appears when I'm using the askopenfilename function of Tkinter. I've tried using Withdraw and destroy (in combination and alone) to fix this issue, but it seems to leave my code stuck in a loop and unable to continue to the next sections.
I have seen several solutions to this in Python 2, but I have no idea how they translate to python 3. Tkinter isn't a module I have a lot of experience with, so it is likely a simple oversight I am making.
Any suggestions or comments are much appreciated
Here is a sample of my code I am using (CSV module is for another section of my code)
import csv
from tkinter import filedialog
from tkinter import *
root= Tk()
root.filename= filedialog.askopenfilename(initialdir = r"\Users",title="Select A File", filetypes= [("Csv Files","*.csv")])
root.mainloop()

Use withdraw to hide root window, deiconify to show root window
import csv
from tkinter import filedialog
from tkinter import *
root=Tk()
# Hide Window
root.withdraw()
filename= filedialog.askopenfilename(initialdir = r"\Users",title="Select A File", filetypes= [("Csv Files","*.csv")])
# Show Window
root.deiconify()
root.mainloop()

Python 3 tkinter: focus_force on messagebox

I'm running python 3 code in background which should show a popup window in some situations. I'm using tkinter for this:
import tkinter as tk
from tkinter import messagebox
def popup(message, title=None):
root = tk.Tk()
root.withdraw()
root.wm_attributes("-topmost", 1)
messagebox.showinfo(title, message, parent=root)
root.destroy()
popup('foo')
The ok-button in this infobox should get the focus automatically when popping up. Sadly I'm not able to do this. I tried root.focus(), but it does not help. Any ideas how to solve that? TIA
BTW: The code should be platform independent (Linux and Windows).
Edit:
Maybe I missunderstood the focus keyword and I should clarify my question:
root = tk.Tk()
root.focus_force()
root.wait_window()
When calling the code above the root window is active, even if I worked in e.g. the browser before. Is this also possible for messagebox.showinfo? Adding root.focus_force() in the popup function does not help.
Is this even possible? Or is it necessary to create my own root window? I really like the appearance of the messagebox with the icon.
Edit 2:
Here is a video: https://filebin.net/no195o9rjy3qq5c4/focus.mp4
The editor is the active window, even after the popup was shown.
In Linux I it works as expected.

You can use the default argument in the messagebox function.
default constant
Which button to make default: ABORT, RETRY, IGNORE, OK, CANCEL, YES, or NO (the constants are defined in the tkMessageBox module).
So, here is an example to highlight the "ok" button.
import tkinter as tk
from tkinter import messagebox
def popup(message, title=None):
root = tk.Tk()
root.withdraw()
messagebox.showinfo(title, message, parent=root, default = "ok")
root.destroy()
popup('foo')
Hope this helps!

Python: How to close the previous Main (top) tkinter windows

I want my script should work in such a way that, close all the previous windows in tkinter.
If I minimise the existing pop up window and again I will run same script, it will again pop up new window. How can I close the already existing window, when i run script again?
Simple code:
import Tkinter as tk
root = tk.Tk()
root.mainloop()

Maybe if you check all variable in locals and see if you have tk type in it?
import tkinter as tk
root = tk.Tk()
tk_type = type(root)
print(tk_type)
var=0
for var in locals().items():
if type(var[1]) == tk_type:
print(var, 'to be deleted')
root.mainloop()
something like this where you can put the test at the begining of the class to see if it exists other TK window object.
I'm sure it should exist a better solution though.

tkinter topmost and overridedirect

I want to write a program with a window set to always at the top and without the border. So I write the following program, which doesn't work as intended (macOS Sierra, 10.12.3):
import tkinter as tk
root=tk.Tk()
tk.Label(root,text='some text').pack()
root.attributes('-topmost',True)
root.overrideredirect(1)
root.mainloop() #this one doesn't work
screenshot of the failed one
However, when I change the sequence of overridedirect and attributes, surprisingly it worked.
import tkinter as tk
root=tk.Tk()
tk.Label(root,text='some text').pack()
root.overrideredirect(1)
root.attributes('-topmost',True)
root.mainloop() #this one works
screenshot of the successful one
Can someone please tell me why the sequence of those two lines matters?

root.overrideredirect and <Any-KeyPress> binding

I would like the following program to quit on <Any-KeyPress> event.
from tkinter import *
root = Tk()
root.overrideredirect(True)
root.bind('<Any-KeyPress>', lambda e: root.destroy())
root.mainloop()
This works fine on Windows OS. However this does not work on Ubuntu unless I remove the line root.overrideredirect(True) from the above code.
Is this the intended behavior ?
Or is there a way whereby I can make my program to work while still using root.overrideredirect(True) ?
Edit
I just saw a similar question here at SO, where Bryan Oakley suggests using root.focus_force() but it does not help.
Edit 2
I used root.attributes('-fullscreen', True) instead of root.overrideredirect(True) as suggested here and that seems to work now.

Try this:
from tkinter import *
root = Tk()
root.bind('<Any-KeyPress>', quit())
root.mainloop()
Assuming that you want the program to quit, keep the code. If you just want to clear the screen, just use root.destroy() rather that quit(). Using root.overrideredirect(True) will NOT work on Ubuntu.