I am trying to write a program that graphically presents three doors and ask the user to choose the “special” door (randomly selected by the program). If the user correctly chooses the special door, it’s a win. If either of the other two non-special doors is selected, it’s a loss.
I am getting the below error, and I don’t understand why.
Traceback (most recent call last):
File "C:/Python27/ThreeButtonMonte_scratch.py", line 81, in <module>
main()
File "C:/Python27/ThreeButtonMonte_scratch.py", line 68, in main
if door == 1 and b1.clicked(pt):
AttributeError: 'NoneType' object has no attribute 'clicked'
Program:
# button.py
from graphics import *
from random import randrange
class Button:
"""A button is a labeled rectangle in a window. It is activate or deactivated with the activated() and deactivated() methods. The clicked(p) method returns true if the button is active and p is inside it."""
def __init__(self, win, center, width, height, label):
""" Creates a rectangle button, eg: qb = Button(myWin, centerPoint, width, height, 'Quit') """
w,h = width/2.0, height/2.0
x,y = center.getX(), center.getY()
self.xmax, self.xmin = x+w, x-w
self.ymax, self.ymin = y+h, y-h
p1 = Point(self.xmin, self.ymin)
p2 = Point(self.xmax, self.ymax)
self.rect = Rectangle(p1, p2)
self.rect.setFill('lightgray')
self.rect.draw(win)
self.label = Text(center, label)
self.label.draw(win)
self.deactivate()
def clicked(self, p):
"Returns true if button is active and p is inside"
return self.active and \
self.xmin <= p.getX() <= self.xmax and \
self.ymin <= p.getY() <= self.ymax
def getlabel(self):
"Returns the label string onf this button"
return self.label.getText()
def activate(self):
"Sets this button to 'active'."
self.label.setFill('black')
self.rect.setWidth(2)
self.active = True
def deactivate(self):
"Sets ths button to 'inactive'."
self.label.setFill('darkgrey')
self.rect.setWidth(1)
self.active = False
def main():
#create application graphics window
win = GraphWin("Three Button Monte")
win.setCoords(0, 0, 20, 10)
win.setBackground("green2")
#Draw the interface
Text(Point(10, 7), "Choose a door").draw(win)
b1 = Button(win, Point(3, 5), 5, 2, "Door 1").activate()
b2 = Button(win, Point(10, 5), 5, 2, "Door 2").activate()
b3 = Button(win, Point(17, 5), 5, 2, "Door 3").activate()
qbutton = Button(win, Point(10, 1.5), 4, 1, "quit")
pt = win.getMouse()
#choose a random door
door = randrange(1, 4)
if door == 1 and b1.clicked(pt):
Text(Point(10, 3), "You Win!")
elif door == 2 and b2.clicked(pt):
Text(Point(10, 3), "You Win!")
elif door == 3 and b3.clicked(pt):
Text(Point(10, 3), "You Win!")
else:
Text(Point(10, 3), "You Lose.")
qbutton.activate()
win.getMouse()
win.close()
main()
