Python Random Color Generation using Turtle -

i need generate random color using r g b values fill in these rectangles python school assignment, i'm getting bad color sequence error though i'm sure i'm formatting python documentation suggests.

r = random.randrange(0, 257, 10) g = random.randrange(0, 257, 10) b = random.randrange(0, 257, 10)   def drawrectangle(t, w, h):     t.setx(random.randrange(-300, 300))     t.sety(random.randrange(-250, 250))     t.color(r, g, b)     t.begin_fill()     in range(2):         t.forward(w)         t.right(90)         t.forward(h)         t.right(90)     t.end_fill()     t.penup() 

i'm quite confused why t.color(r, g, b) not producing random color?

turtle.colormode needs set 255 give color strings in hex code or r g b.

adding

screen.colormode(255) 

no longer returned error.