How to return a value of a function given as a command in tkinter

Question

I\'ve written a very simple code with python tkinter, it contains an input box. I\'d like to keep the value inserted by the user to myself, in case I need to use it

Answer 1

I would recommend using OOP approach, to have an object retaining a state:

import tkinter as tk


class Program:
    def __init__(self):
        self.root = tk.Tk()
        self.name_label = tk.Label(self.root, text='Username',
                                   font=('calibre', 10, 'bold'))
        self.name_entry = tk.Entry(self.root, font=('calibre', 10, 'normal'))
        self.sub_btn = tk.Button(self.root, text='Submit', command=self.submit)
        self.submitted_var = tk.StringVar()

        self.submitted_label = tk.Label(self.root, text="Submitted name: ")
        self.submitted_entry = tk.Label(self.root, textvariable=self.submitted_var)

    def setup(self):
        self.submitted_label.grid(row=0, column=0)
        self.submitted_entry.grid(row=0, column=1)
        self.name_label.grid(row=1, column=0)
        self.name_entry.grid(row=1, column=1)
        self.sub_btn.grid(row=2, column=1)

    def submit(self):
        self.submitted_var.set(self.name_entry.get())

    def run(self):
        self.setup()
        self.root.mainloop()

if __name__ == '__main__':
    Program().run()

Then you can use self.submitted_var.get() anywhere to get the last submitted value. Although, the more straight-forward way would be to link a StringVar directly to name_entry, but then it would change every time the Entry widget value changes, rendering the submit button useless.