[Tutor] Help on Assignments - Turtle
alan.gauld at yahoo.co.uk
Sat Jul 30 19:03:42 EDT 2016
On 30/07/16 16:28, Justin Korn via Tutor wrote:
> I have been working on these assignments for a week and a half,
> and I can't make any progress. I also been dealing with a
> sick relative, so please help me out immediately.
While I sympathise with your circumstances we are all
volunteers here so the help you receive will be at the
speed that suits the members.
I will address your two assignments in separate mails.
> import turtle
> class turtle_Turtle():
> ts = turtle.Screen()
> bob = turtle.Turtle()
I'm not sure what you think this is doing but I'm
pretty sure its not what you want. You are basically
defining a couple of class variables and nothing else...
> class TurtleGTX(turtle_Turtle):
I would have expected you to inherit from turtle.Turtle
rather than turtle_Turtle. The latter has no methods and
only two class variables. So your GTX class likewise has
no inherited methods, you will need to define all of
> odometer = 0
This is a class variable meaning it is shared by all
turtles. I suspect you really want it to be an instance
attribute, which means defined within an __init__()
> def forward(x):
The first parameter of a class method is usually called
self because it will refer to the active object. In this
case your x will be the object, whereas I think you want
it to be the distance to move? But if so x is a bad choice
of name since it implies horizontal direction only
> if (x >= 0):
> i = 0
> while (i < x):
> odometer += 1
This is a horribly inefficient way of saying
odometer += x
But it won't work because
a) You didn't inherit from turtle so you don't have a fd() method
b) Even if you had it requires an input value for its distance
so should be self.fd(1)
> i = 0
> while (i > x):
> odometer +=1
Again a very inefficient alternative to
x = -x
odometer += x
> print ("Odometer is", odemeter)
Do you really want to print that every time the turtle moves?
> my_turtle = TurtleGTX()
You misspelled forward and failed to give it an x value.
Please send real code and/or any error messages. This code
could never have run so you should have errors.
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