Tkinter is not showing string Python

Question

I am trying to display a popup message in tkinter but I don't know why it's not showing in the window. Here is my code :

def popupmsg(msg):
    popup = tk.Tk()
    popup.wm_title("Results ")

    data_string = tk.StringVar()
    data_string.set(msg)
    ent = tk.Entry(popup, textvariable=data_string, fg="black", bg="white", bd=0, state="readonly")
    ent.pack(side="top", fill="x", pady=10)
    B1 = tk.Button(popup, text="Okay", command=popup.destroy)
    B1.pack()
    popup.mainloop()

This is how I am calling :

string = " "
for f in final:
    string = string + " " + f + " \n"
# print("Results : \n" + string)
popupmsg("Results : \n" + string)

This is I what I get : Msg is missing

@Gnanavel can you please read the question again, I have updated code . — Hamza Arshad, Oct 24 '20 at 11:08
It's a list that contains URLs .. even if I try `popupmsg("abc")` it does not show up there — Hamza Arshad, Oct 24 '20 at 11:11
Use `toplevel()` instead of `Tk()`. I think you have another instance of `Tk()` already, the root window. — acw1668, Oct 24 '20 at 12:45

Gnanavel · Answer 1 · 2020-10-24T12:38:14.487

0

Try this...

import tkinter as tk
def popupmsg(msg):
    popup = tk.Tk()
    popup.wm_title("Results ")
    data_string = tk.StringVar()
    data_string.set(msg)
    ent = tk.Entry(popup, textvariable=data_string, fg="black", bg="white", bd=0)
    ent.configure(state='readonly')
    ent.pack(side="top", fill="x", pady=10)
    B1 = tk.Button(popup, text="Okay", command=popup.destroy)
    B1.pack()
    popup.mainloop()

edited Oct 24 '20 at 12:38

answered Oct 24 '20 at 11:22

Gnanavel

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6
18

This code runs separately , but when I am replacing it within main file it's not showing Entry – Hamza Arshad Oct 24 '20 at 11:27
1

So please put the full code inside main file in question. – Gnanavel Oct 24 '20 at 11:28
If I remove `state="readonly` it displays an empty Entry widget but does not show any textvariable. If I try to print `data_string.get()` it prints the value of msg but it does not show up there – Hamza Arshad Oct 24 '20 at 11:28
@HamzaArshad I updated my answer.Try that whether it works or not. – Gnanavel Oct 24 '20 at 12:39

score 0 · Accepted Answer · answered Oct 24 '20 at 13:28

You are using more than one instance of Tk(). So the StringVar() doesnt know which parent to belong to, so to fix this, try replacing all child Tk() with Toplevel() leaving you with just one Tk().

The non recommended way would be to say data_string = tk.StringVar(master=popup) but still creating two instance of Tk() is gonna cause another bunch of problems on the way. Why are multiple instances of Tk discouraged?

Since your not getting the output only and no error is shown, this would be the obvious error, if this does not work, please provide more debugging details or some more code.

Tkinter is not showing string Python

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