"AttributeError: 'Turtle' object has no attribute 'colormode'" despite Turtle.py having colormode atttribute

Question

I tried running the code that uses the Turtle library on this site, shown here,

import turtle
import random

def main():
    tList = []
    head = 0
    numTurtles = 10
    wn = turtle.Screen()
    wn.setup(500,500)
    for i in range(numTurtles):
        nt = turtle.Turtle()   # Make a new turtle, initialize values
        nt.setheading(head)
        nt.pensize(2)
        nt.color(random.randrange(256),random.randrange(256),random.randrange(256))
        nt.speed(10)
        wn.tracer(30,0)
        tList.append(nt)       # Add the new turtle to the list
        head = head + 360/numTurtles

    for i in range(100):
        moveTurtles(tList,15,i)

    w = tList[0]
    w.up()
    w.goto(0,40)
    w.write("How to Think Like a ",True,"center","40pt Bold")
    w.goto(0,-35)
    w.write("Computer Scientist",True,"center","40pt Bold")

def moveTurtles(turtleList,dist,angle):
    for turtle in turtleList:   # Make every turtle on the list do the same actions.
        turtle.forward(dist)
        turtle.right(angle)

main()

in my own Python editor and I got this error:

turtle.TurtleGraphicsError: bad color sequence: (236, 197, 141)

Then, based on this answer on another site, I added in this line before "nt.color(......)"

nt.colormode(255)

Now it's showing me this error

AttributeError: 'Turtle' object has no attribute 'colormode'

Okay, so I checked my Python library and looked into the contents of Turtle.py. The colormode() attribute is definitely there. What is making the code able to run on the original site but not on my own computer?

Bond

Can you post,or link to the code you're using? I have an educated guess, what's wrong, but it's a little hard to be sure with the limited information you've posted. – Foetation

Ah, I missed that the code was initially hidden - all I noticed was lots of other links. – Foetation

Answer 1

The issue is that your Turtle object (nt) doesn't have a colormode method. There is one in the turtle module itself though.

So you just need:

turtle.colormode(255) 

instead of

nt.colormode(255)

Edit: To try to clarify your question in the comment, suppose I create a module called test.py, with a function, and a class, 'Test':

# module test.py

def colormode():
    print("called colormode() function in module test")

class Test
    def __init__(self):
        pass

Now, I use this module:

import test

nt = test.Test()  # created an instance of this class (like `turtle.Turtle()`)
# nt.colormode()  # won't work, since `colormode` isn't a method in the `Test` class
test.colormode()  # works, since `colormode` is defined directly in the `test` module

Foetation

That actually worked, thank you. It does compile that part of the code now, but I just don't quite understand why my original line didn't work if the other "nt" lines have methods that the code doesn't even define beforehand. – Bond

So the colormode() function is out of its scope. That makes complete sense, thank you! – Bond

Answer 2

Screen class in turtle module has colormode() method. You can call screen_object.colormode(255). In your code it would be:

wn.colormode(255)

Chops

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. – Hector

This answer is perfectly clear. – Terrorist

Answer 3

The problem is that you need to set up the colormode() attribute = 255. The class to reference is Screen(), based on your code you referenced this code as wn = turtle.Screen(). In order for you to make your code work, just by adding the following line of code.

wn.colormode(255)

Ascendancy

Answer 4

I'll take a crack at answering the question, but Meera's answer is the correct one.

The answer is you don't set the colormode on the class (Turtle), the package (turtle), or the instantiated Turtle object (the variable "nt" in your code).

In your code, you created a screen object (see variable "wn") After you create your screen object, set the colormode on your object.

As stated above in your code you would use the following instruction between lines 7 and 8:

wn.colormode(255)

Terrorist