Flipping screens in and out is a really cool facility to be able to command and the lift and lower commands are what enable you to do it.  You should note that the rest of the computer world outside of Python calls “lift” by the moniker “raise” – but that is a reserved word in Python so Lundh (I guess) made it lift.  Sometime lift and lower don’t do what you think so you also need to understand the topmost attribute. For example, if top1 is one of your toplevel screens then top.wm_attributes(“-topmost”, 1) sticks it on top.  Note the wm_ is now optional and probably will be deprecated someday.  The better form is probably  top.attributes(“-topmost”, 1) to stick it on top and  top.attributes(“-topmost”, 0) to release it.

<pre>#lift/lower/raise and topmost test
#variation of tkinter test set up
#____________________________
from tkinter import *
root = Tk()
root.wm_attributes('-fullscreen', True) #create a clean visual test environment
root.configure(background='linen')
scrW = root.winfo_screenwidth() # use commands to get screenwidth and height
scrH = root.winfo_screenheight()  #oddly - not always = fullscreen
wholescreen = str(900) + "x" + str(500)
top1 = Toplevel(root, bg="light blue")
top1.geometry(wholescreen +"+100"+"+100")
top1.title("Top 1 Window")
b1=Button(top1, text="end it all", command=root.destroy)
b1.grid(row=0,column=0,ipadx=10, ipady=10, pady=5, padx=5, sticky = W+N)
#____________________________remember root.mainloop()
#toplevels purposefully offset for demonstration

top2= Toplevel(root, bg="ivory")
top2.geometry(wholescreen)
top2.title("Top 2 Window")

b2=Button(top2, text="egress", command=root.destroy)
b2.grid(row=0,column=0,ipadx=10, ipady=10, pady=5, padx=5)

# in this case using lambda is clearer code than a function
b3=Button(top1,text="1. lift top2", command= lambda: top2.lift(aboveThis=None))
b3.grid(row=1,column=1, ipadx=10, ipady=10, pady=5, padx=5)

b4=Button(top2,text="2. lift top1", command= lambda: top1.lift(aboveThis=None))
b4.grid(row=1,column=1, ipadx=10, ipady=10, pady=5, padx=5)

root.update() # position in process for this update is CRITICAL

top1.wm_attributes("-topmost", 1)  # make sure top1 is on top to start
top1.wm_attributes("-topmost", 0)  # but is not stuck on top all the time

root.mainloop()

</pre>