Commit 3fadbd8

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draw a dot petern

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	`1`	`+import turtle`
	`2`	`+`
	`3`	`+def draw_pattern(t, height, width, dot_distance):`
	`4`	`+ for i in range(height):`
	`5`	`+ for i in range(width):`
	`6`	`+ t.dot()`
	`7`	`+ t.forward(dot_distance)`
	`8`	`+ t.back(dot_distance*width)`
	`9`	`+ t.right(90)`
	`10`	`+ t.forward(dot_distance)`
	`11`	`+ t.left(90)`
	`12`	`+`
	`13`	`+def draw_art():`
	`14`	`+ window = turtle.Screen()`
	`15`	`+ t = turtle.Turtle()`
	`16`	`+ t.speed(50)`
	`17`	`+ dot_distance = 10`
	`18`	`+ width = 20`
	`19`	`+ height = 20`
	`20`	`+ t.penup()`
	`21`	`+ draw_pattern(t, height, width, dot_distance)`
	`22`	`+`
	`23`	`+`
	`24`	`+ window.exitonclick()`
	`25`	`+`
	`26`	`+draw_art()`

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