Child to Parent data transfer

Tkinter Toplevel
We will pass user entered data in one Entry area of child window. On click of button the user entered data will be passed to parent window and displayed as one existing string variable.
Pass data from child to parent windows

Passing data between child and parent window in Tkinter Toplevel

You can read basics of Parent and Child window here
We are using one string variable in parent window and assigned a string to it. In child window on click of a button the text entered at Entry box will transfer to parent window.
import tkinter as tk
from tkinter import * 
my_w = tk.Tk()
my_w.geometry("200x200")  # Size of the window 
my_w.title("www.plus2net.com")  # Adding a title

# create one lebel 
my_str = tk.StringVar()
l1 = tk.Label(my_w,  textvariable=my_str )
l1.grid(row=1,column=2) 
my_str.set("Hi I am main window")
# add one button 
b1 = tk.Button(my_w, text='Clik me to open new window',
               command=lambda:my_open())
b1.grid(row=2,column=2) 

def my_open():
    my_w_child=Toplevel(my_w) # Child window 
    my_w_child.geometry("250x200")  # Size of the window 
    my_w_child.title("www.plus2net.com")

    l1 = tk.Label(my_w_child,  text='Your Name', width=10 ) 
    l1.grid(row=1,column=1) 

    e1 = tk.Entry(my_w_child, width=20,bg='yellow') 
    e1.grid(row=1,column=2)
    b2 = tk.Button(my_w_child, text='Submit',
               command=lambda:my_str.set(e1.get()))
    b2.grid(row=2,column=2) 
    b3 = tk.Button(my_w_child, text=' Close Child',
                   command=my_w_child.destroy)
    b3.grid(row=3,column=2)
    
my_w.mainloop()
View & Download tkinter-toplevel-data ipynb file (.html format)

Passing data from Parent to Child

Pass data from parent to child windows
We will place one Entry widget ( e2 ) at Parent window and while opening the child window the data entered inside the Entry widget will be displayed in the child window ( l3 ).

We will keep the Label at child window and it will read the data entered at Entry box of parent window
l3=tk.Label(my_w_child,text=e2.get())
    l3.grid(row=3,column=1)
Note here how the data is collected by using e2.get(). The code for Entry is here
e2=tk.Entry(my_w,width=10)
e2.grid(row=2,column=1)
Full code to transfer data from Parent to Child is here
import tkinter as tk
my_w = tk.Tk()
my_w.geometry("250x200+200+50") 
l1_str=tk.StringVar()
font1=('Times',18,'bold')	
l1=tk.Label(my_w,textvariable=l1_str,font=font1)
l1.grid(row=1,column=1)
l1_str.set('Parent window')

e2=tk.Entry(my_w,width=10)
e2.grid(row=2,column=1)
b1=tk.Button(my_w,text='Open Child',command=lambda:my_open())
b1.grid(row=2,column=2)
def my_open():
    my_w_child=tk.Toplevel(my_w)
    my_w_child.geometry("200x200")
    my_w_child.title('www.plus2net.com')
    my_str1=tk.StringVar()
    l1=tk.Label(my_w_child,text='Your name')
    l1.grid(row=1,column=1)
    e1=tk.Entry(my_w_child, bg='yellow')
    e1.grid(row=1,column=2)
    b2=tk.Button(my_w_child,text='Submit',
    command=lambda:l1_str.set(e1.get()))
    b2.grid(row=2,column=1)
    my_str1.set('Your Name')
    l3=tk.Label(my_w_child,text=e2.get())
    l3.grid(row=3,column=1)
   
my_w.mainloop()  # Keep the window open

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