figuras en python turtle

go(200)
turn(90)
go(200)
turn(90)
go(200)
turn(90)
go(200)
pen_up()
go(100)
turn(-90)
turn(-180)
for i in range(3)
  File "<console>", line 1
    for i in range(3)
                   
^
SyntaxError: invalid syntax
 for i in range (3)go(100)turn(360/3)
  File "<console>", line 1
    for i in range (3)go(100)turn(360/3)
   ^
IndentationError: unexpected indent
for i in range(3):
 go(100)
 turn(360/3)

turn (90)
turn(180)
go(100)
color("white")
for i in range(3):
 go(50)
 turn(360/3)

pen_down
<function pen_down at 0x03412F30>
pen_down()


go(1)
for i in range(3):
go(50)
  File "<console>", line 2
    go(50)
     ^
IndentationError: expected an indented block
for i in range(3):
 go(50)
 turn(360/3)

turn(-90)
pen_up()
go(200)
turn(180)
pen_down()
color("blue")
for i in range(6):
 go(100)
 turn(360/6)