This little script makes you get the user input.
import tkinter as tk
def check(event):
global url
user_input = entry.get()
label['text'] = user_input
button = tk.Button(root, text="Chiudi", command=root.destroy)
button.pack()
# root.destroy()
# Input from user
root = tk.Tk()
root.title("Insert Something here")
# v = tk.StringVar()
label = tk.Label(root, text="Insert ..... and the press Return")
label['font'] = "Arial 20"
label.pack()
entry = tk.Entry(root)
entry.pack(fill=tk.BOTH, expand=1)
entry.bind("<Return>", check)
entry.focus()
root.mainloop()