save project

qw.py

 import turtle
 import turtle
 pen=turtle.Pen()
 pen=turtle.Pen()
-t=1
+screen=turtle.Screen()
+screen.bgcolor("black")
+color=["blue","red","green","yellow"]
 pen.hideturtle()
 pen.hideturtle()
-for i in range(1,300):
+for i in range(1,50,2):
+    pen.pencolor(color[i%4])
     pen.forward(i)
     pen.forward(i)
     pen.right(91)
     pen.right(91)
 turtle.done()
 turtle.done()