Tkinter: assigning entry to a variable returns None-CodePudding

I am getting None as name and age from the entry of Tkinter and I can't make it work. Please, what is wrong? The following code is identical with the one used in this tutorial:

from tkinter import *  
from tkinter import Entry

main_window = Tk()

Label(main_window, text="Enter your name  ").grid(row=0, column=0)  
Label(main_window, text="What's your age  ").grid(row=1, column=0)

my_name = Entry(main_window, width=30, borderwidth=5).grid(row=0, column=1)  
my_age = Entry(main_window, width=30, borderwidth=5).grid(row=1, column=1)

def on_click():  
    print(f'My name is {my_name}, and my age is {my_age}.')

Button(main_window, text='Click Me', command=on_click).grid(row=2, column=1)

main_window.mainloop()

I read on youtube and here to try the get method, but I am just starting with programming, and I must be doing something wrong because nothing is working.

CodePudding user response：

The return value from a call to .grid() method is None. So both of the variables my_age and my_name value once the line has finished processing is None and you no longer have a reference variable for the widgets. you need to split up the calls that create the objects and the call to grid.

The same would be true for the labels also if you needed to keep a reference to them after they have been created. But since you don't you can leave those lines the way they are.

from tkinter import *  
from tkinter import Entry

main_window = Tk()

Label(main_window, text="Enter your name  ").grid(row=0, column=0)  
Label(main_window, text="What's your age  ").grid(row=1, column=0)

my_name = Entry(main_window, width=30, borderwidth=5)
my_name.grid(row=0, column=1)  
my_age = Entry(main_window, width=30, borderwidth=5)
my_age.grid(row=1, column=1)

def on_click():  
    print(f'My name is {my_name}, and my age is {my_age}.')

Button(main_window, text='Click Me', command=on_click).grid(row=2, column=1)

main_window.mainloop()