buram_python.py

# pass data from 1 window parent to child window

from tkinter import *

class trackApp(Frame):

    def __init__(self, master):
        Frame.__init__(self, master)

        self.mainVar1 = IntVar()
        self.mainVar2 = IntVar()

        self.mainVar1.set(100)
        self.mainVar2.set(100)
        self.master = master
        self.master.geometry('400x200+100+200')
        self.master.title('MAIN WINDOW')

        self.label1=Label(self.master,text='Variable1 : ').grid(row=1,column=1)
        self.mainEntry1=Entry(self.master,textvariable=self.mainVar1).grid(row=1,column=2)

        self.label2=Label(self.master,text='Variable2 : ').grid(row=2,column=1)
        self.mainEntry2=Entry(self.master,textvariable=self.mainVar2).grid(row=2,column=2)

        self.button1=Button(self.master,text='Child',command=self.dialogWindow).grid(row=7,column=2)


    def new_data(self, data):
        self.mainVar1.set(data['var1'])
        self.mainVar2.set(data['var2'])


    def dialogWindow(self):
        # Build a list from control variables used in the main window text entry boxes
        mainList = [self.mainVar1.get(),self.mainVar2.get()]

        top=Toplevel(self.master)
        childDialog=childWindow(top, mainList, self)


class childWindow(Frame):

    # Pass data (list) to the child
    def __init__(self, master, list, app):

        self.list = list

        self.app = app
        self.master = master
        self.master.geometry('300x100+150+250')
        self.master.title('CHILD WINDOW')

        # Define control variabels to be used with child window text entry widgets
        self.childvar1 = IntVar()
        self.childvar2 = IntVar()

        # Fill child window text entry widgets with inf. from parent window
        self.childvar1.set(list[0])
        self.childvar2.set(list[1])

        # Text entry widgets
        self.label1=Label(self.master,text='Enter New value 1').grid(row=0,column=1)
        self.childEntry1=Entry(self.master,textvariable=self.childvar1).grid(row=0,column=2)

        self.label2=Label(self.master,text='Enter New value 2').grid(row=1,column=1)
        self.childEntry2=Entry(self.master,textvariable=self.childvar2).grid(row=1,column=2)

        self.button1=Button(self.master,text='OK',command=self.childDestroy).grid(row=3,column=1)


    def childDestroy(self):

        self.data = {}
        self.data['var1'] = self.childvar1.get()
        self.data['var2'] = self.childvar2.get()

        self.app.new_data(self.data)  # <<<<<<<<< How to call the parent new_data method

        self.master.destroy()


def main():
    root = Tk()
    app = trackApp(root)
    root.mainloop()

if __name__ == "__main__":
    main()