本文实例主要是对turtle的使用，实现Python+turtle动态绘制一棵树的实例，具体代码：

# drawtree.py

from turtle import Turtle, mainloop

def tree(plist, l, a, f):

""" plist is list of pens

l is length of branch

a is half of the angle between 2 branches

f is factor by which branch is shortened

from level to level."""

if l > 5: #

lst = []

for p in plist:

p.forward(l)#沿着当前的方向画画Move the turtle forward by the specified distance, in the direction the turtle is headed.

q = p.clone()#Create and return a clone of the turtle with same position, heading and turtle properties.

p.left(a) #Turn turtle left by angle units

q.right(a)# turn turtle right by angle units, nits are by default degrees, but can be set via the degrees() and radians() functions.

lst.append(p)#将元素增加到列表的最后

lst.append(q)

tree(lst, l*f, a, f)

def main():

p = Turtle()

p.color("green")

p.pensize(5)

#p.setundobuffer(None)

p.hideturtle() #Make the turtle invisible. It's a good idea to do this while you're in the middle of doing some complex drawing,

#because hiding the turtle speeds up the drawing observably.

#p.speed(10)

# p.getscreen().tracer(1,0)#Return the TurtleScreen object the turtle is drawing on.

p.speed(10)

#TurtleScreen methods can then be called for that object.

p.left(90)# Turn turtle left by angle units. direction 调整画笔

p.penup() #Pull the pen up – no drawing when moving.

p.goto(0,-200)#Move turtle to an absolute position. If the pen is down, draw line. Do not change the turtle's orientation.

p.pendown()# Pull the pen down – drawing when moving. 这三条语句是一个组合相当于先把笔收起来再移动到指定位置，再把笔放下开始画

#否则turtle一移动就会自动的把线画出来

#t = tree([p], 200, 65, 0.6375)

t = tree([p], 200, 65, 0.6375)

main()

实现效果：

总结

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