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1. I am currently, learning Charles Dierbach's book, Introduction to Computer Science using Python.

I am trying to make my turtle bounce off the canvas but it does not work. I have tried different variations but have not being able to fix it

Here is my code:

Code:
```
Code:
#Drunkard walk PYTHON

from turtle import *
from random import *

#draw a house
def house(t):
pu()
goto(270,100)
pd()
pensize(5)
for i in range(4):
fd(100)
right(90)
fd(100)
fd(100)
pu()
goto(200,0)
pd()
fd(70)
fd(40)
fd(70)
pu()

pu()
goto(80, 280)
pd()
begin_fill()
color('black')
fd(250)
fd(100)
fd(250)
fd(100)
end_fill()
pu()
goto(80,25)
pd()
begin_fill()
color('white')
for i in range(4):
fd(70)
right(90)
fd(100)
right(90)
end_fill()
pu()
goto(80, -45)
pd()
begin_fill()
color('black')
fd(240)
fd(100)
fd(240)
fd(100)
end_fill()

#this is my code to keep turtle on canvas
def isInScreen(window, t):
xmin=-299
xmax=299
ymin=-299
ymax=299

xTcor = t.xcor()
yTcor = t.ycor()

if xTcor<xmin or xTcor>xmax:
if yTcor<ymin or yTcor>ymax:
#house coord
if (170<=xTcor<=200 or 200<=xTcor<=270)and yTcor==0:
if xTcor==170 and 0<=yTcor<=100:
if (170<=xTcor<=200 or 200<=xTcor<=270) and yTcor==100:
if xTcor==270 and 0<=yTcor<=100:
if 170<=xTcor<=271 and 100<=yTcor<=150:
if  200<=xTcor<=240 and yTcor ==0:
return  100

#################MAIN####################
setup(600,600)
window=Screen()
window.title("Drunkard walk")
window.bgcolor("grey")

#get the turtle and change the shape
t=getturtle()
t.shape('turtle')
shapesize(2,1.2,1.2)

pu()

#change coords and make the ouer roads
goto(290,290)
pd()
pensize(10)

for i in range(4):
fd(580)
right(90)

shape('circle')
house(t)
goto(80,0)
penup()
goto(-250,-260)
shapesize(1,1,1)
walking = True
while walking:
pendown()
fd(10)
color = choice(["black", "red", "yellow", "blue", "white", "green"])
fillcolor(color)
ch = randrange(2)
if ch == 0:
left(90)
else:
right(90)

mainloop()
exitonclick()
```

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