Error using checkmouse - python-3.x

Question

I'm trying to use checkmouse in order to undraw something from my window. When someone clicks the button it should undraw the text and write something else. I'm using checkMouse and getX() and getY() to do this but i keep receiving this error that states:
File "C:\Users\User\Documents\python\project2.py", line 71, in panel
if (clicknew.getX()>90 and clicknew.getX()<210) and (clicknew.getY()>35 and clicknew.getY() < 0):
AttributeError: 'NoneType' object has no attribute 'getX'
this code that i have done so far is as follows:
from graphics import *
#creating the game panel window
def panel():
#grey window, with coordinates flipped, with banners etc
win = GraphWin("Start Panel", 300,200)
win.setCoords(0,0,300,200)
win.setBackground("light grey")
#drawing the BoilerMazer banner with text
boilermazer = Rectangle(Point(0,200),Point(300,160))
boilermazer.setFill("white")
boilermazer.draw(win)
#text inside
banner1 = Text(Point(150,180),"BoilerMazer")
banner1.setStyle("bold")
banner1.setSize(20)
banner1.draw(win)
#initial game panel is going to have two buttons and a top scores object
#top score "screen"
toprec = Rectangle(Point(60,140),Point(240,50))
toprec.setFill("white")
toprec.draw(win)
#text inside toprec
topscores = Text(Point(150,130),"TOP SCORES")
topscores.setSize(8)
topscores.draw(win)
border = Text(Point(150,120),"======")
border.draw(win)
bigmac = Text(Point(150,110),"Big Mac 21")
bigmac.setSize(8)
bigmac.draw(win)
tt = Text(Point(150,90),"T.T 23")
tt.setSize(8)
tt.draw(win)
cshell = Text(Point(150,75),"C-Shell 25")
cshell.setSize(8)
cshell.draw(win)
macmac = Text(Point(150,55),"MacMac 27")
macmac.setSize(8)
macmac.draw(win)
#new player button that will eventually be clicked
new1 = Point(90,35)
new2 = Point(210,0)
newrec = Rectangle(new1,new2)
newrec.setFill("chartreuse2")
newrec.draw(win)
#new player button text
newplayer = Text(Point(150,18),"NEW PLAYER")
newplayer.draw(win)
#reset button
resetrec = Rectangle(Point(240,35),Point(300,0))
resetrec.setFill("red")
resetrec.draw(win)
#resettext
reset = Text(Point(270,18),"RESET")
reset.draw(win)
#secondary panel window is the game panel after they click new player
#set up points that we check between for the new player button first
#setting up the checkmouse
clicknew = win.checkMouse()
if (clicknew.getX()>90 and clicknew.getX()<210) and (clicknew.getY()>35 and clicknew.getY() < 0):
newplayer.undraw()
you can find the graphics window here:http://mcsp.wartburg.edu/zelle/python/graphics.py
I don't understand what I'm doing wrong, is there some other method that I'm supposed to be using? Thanks for your help

Answer 1

According to the docs, checkMouse() returns None if no mouse click has been detected priorly. So that seems to be the case.
You could put a loop around the call to checkMouse and keep checking if clicknew is not None and only in that case go on in your program. But maybe there's a better way...
UPDATE:
Example:
while True:
clicknew = win.getMouse()
if clicknew:
break
else:
time.sleep(0.1) # avoid busy waiting
# clicknew is set now => use it