[Tutor] help with colormode

[Mark Alderson]

hi

Ihave a very small program.  I want to cycle colours.  I cant set the colormode from 1 to 255

tried screen.colormode(255)

tells me screen is not defined.  the program works without the colormode, but i want to use it.

I just change the a and b variable values to generate new art.

-------------------------------------code-----------------
from turtle import Turtle
t = Turtle()
t.speed(0)

b = 180

a = 35

colormode(255)

t.color((55,55,55))
for i in range(200):
    t.circle(i,a)
    t.right(b)
    t.circle(i,a)


#input('Press any key to continue...')

-------------------------------------------------------------------------

===========error=======================
Traceback (most recent call last):
  File "H:\python\snowflake.py", line 9, in <module>
    screen.colormode(255)
NameError: name 'screen' is not defined
===================================

any help would be appreciated,
thanks

Mark

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