[Python] How to move a turtle stamp in python

How do I move a stamp in python turtle module?

Here's my code so far:

import turtle

def draw_start():
turtle.pu()
turtle.setpos(-350,300)
turtle.pendown()
turtle.right(90)
turtle.forward(520)


def draw_finish():
turtle.speed(15)
turtle.pu()
for i in range(18):
turtle.setpos(200,(300-(i*30)))
square()
for j in range(18):
turtle.setpos(215,(285-(j*30)))
square()

def stamp_turtle(x,y,color):
turtle.pu()
turtle.setheading(0)
turtle.shape("turtle")
turtle.color(color)
turtle.setpos(x,y)
stamp_list.append(turtle.stamp())

def square():
turtle.pu()
turtle.fill(True)
for i in range(4):
turtle.forward(15)
turtle.right(90)
turtle.fill(False)

print "Welcome to Turtle Racing : "
number_of_turtles = int(raw_input("How many turtles (between 3 and 6) : "))
bet_amount = int(raw_input("How much do you want to bet? $ "))
bet_turtle = raw_input("Which turtle (1 to 5)? ")

color_list=["red","blue","green","brown","yellow","purple"]
stamp_list=[]
draw_start()
draw_finish()
for i in range(number_of_turtles):
stamp_turtle(-370,280-i*90,color_list)`

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