How to add the treeview numbers to get the grand total in tkinter entry box

 in this blog we are going to know about the adding of the integers in the treeview and get the total in the entry box of tkinter so here is the image first

so the coding to do such things are here as follow

but here is the condition that pls make assured that the state of entry box is disabled.......

    for child in my_tree1.get_children():

        e2l.config(state="normal")

        b1 += float(my_tree1.item(child, "values")[3])

        var2.set(b1)

        e2l.config(state="disable")

    l2l=Label(ento,text="Purnea-2",width=8)

    l2l.grid(row=0,column=1)

    e2l=Entry(ento,textvariable=var2,state="disable",width=8)

    e2l.grid(row=1,column=1)