turtle library

redd

1. # turtle
   
2. import turtle
   
3. t = turtle.Pen()
   
4. for x in range(100):
   
5.     t.forward(x)
   
6.     t.left(90)

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正方形

redd

1. # turtle
   
2. import turtle
   
3. t = turtle.Pen()
   
4. for x in range(100):
   
5.     t.forward(x)
   
6.     t.left(91)

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螺旋形（和上例角度只差一度）

redd

1. # turtle
   
2. import turtle
   
3. t = turtle.Pen()
   
4. for x in range(100):
   
5.     t.circle(x)
   
6.     t.left(91)

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圓形

redd

1. # turtle
   
2. import turtle
   
3. t = turtle.Pen()
   
4. t.pencolor("MistyRose")
   
5. for x in range(80):
   
6.     t.forward(x)
   
7.     t.left(91)

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加上顏色，顏色名稱：
http://www.tcl.tk/man/tcl8.4/TkCmd/colors.htm

redd

1. # turtle
   
2. import turtle
   
3. t = turtle.Pen()
   
4. colors = ["peru","green","tan","maroon"]
   
5. for x in range(80):
   
6.     t.pencolor(colors[x%4])
   
7.     t.forward(x)
   
8.     t.left(91)

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使用不同顏色

redd

1. # turtle
   
2. import turtle
   
3. turtle.bgcolor("black")
   
4. t = turtle.Pen()
   
5. colors = ["peru","green","tan","maroon"]
   
6. for x in range(130):
   
7.     t.pencolor(colors[x%4])
   
8.     t.circle(x)
   
9.     t.left(91)

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設定背景顏色

redd

1. t.width(2)

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線條粗細