auto save

my_tree.py

-import turtle  # 导入turtle模块
+import turtle
+import random
 
-pen = turtle.Turtle()  # 创建画笔用turtle.Turtle()方法并赋值给变量pen
-pen.color('sienna')  # 设置画笔颜色用pen.color()方法参数为sienna
+def tree(n):  # 画树枝
+    if n>=0:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-10)
+        pen.left(60)
+        tree(n-10)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+pen = turtle.Turtle()
+pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
-w.bgcolor('wheat')   # 设置画布颜色wheat小麦
-# 移动到起点
-pen.left(90)  # 左转90
-pen.up()      # 抬笔
-pen.backward(150)  # 后退150
-pen.down()    # 落笔
+w.bgcolor('wheat')      # wheat小麦
 
-# 分形树
-def tree(n):  # def定义tree()函数参数为n
-    if n >= 50:  # if判断变量n>=50
-        pen.forward(n)  # 前进变量n
-        pen.right(30)   # 右转30
-        tree(n-10)      # 函数tree()的值改为n-10增加递归层数
-        pen.left(60)    # 左转60
-        tree(n-10)      # 函数tree()的值改为n-10增加递归层数
-        pen.right(30)   # 右转30
-        pen.up()        # 抬笔
-        pen.backward(n) # 后退变量n
-        pen.down()      # 落笔
+# 移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)    # 后退
+pen.down()
 
-tree(100)  # tree()方法参数为100
-turtle.done()  # turtle.done()方法
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+tree(60)
+turtle.done()
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