import turtle as t


t1 = t.Turtle(shape = 'turtle')

t2 = t.Turtle()


def co_x(x):
    t1.goto(x,0)
    t1.goto(-x,0)
    





def co_y(y):
    t2.color("red")
    t2.goto(0,y)
    t2.goto(0,-y)





# création d'un repére en x,y de 50 py 
co_y(50)
co_x(50)