Is there a way to check if a turtle is touching a color?

Question

I am tryng to make a game with edge walls and inner walls but I don't know how to sense if the turtle is touching the inner wall(the outer wall checks turtles position and moves him back). My outer wall code is this:

import turtle
t = turtle.Turtle()
if t.xcor() >= 425:
        t.setx(424)
    if t.xcor() <= -425:
        t.setx(-424)
    if t.ycor() >= 375:
        t.sety(374)
    if t.ycor() <= -350:
        t.sety(-349)

and my walls should look like this:

in the center of turtle screen

Answer 1

Assuming your graph is something like this:

Here is how:

if -350 < turtle.xcor() < 350 and -325 < turtle.ycor() < 325: # For A
    if turtle.xcor() >= 350:
        turtle.setx(349)
    if turtle.xcor() <= -350 and (25 < turtle.ycor() < 325 or -25 > turtle.ycor() > -325):
        turtle.setx(-349)
    if turtle.ycor() >= 325:
        turtle.sety(324)
    if turtle.ycor() <= -325:
        turtle.sety(-324)

if -25 < turtle.ycor() < 25 and -425 < turtle.xcor() < -350: # For B
    if turtle.ycor() > 25:
        turtle.sety(24)
    if turtle.ycor() < -25:
        turtle.sety(-24)