auto save

my_tree.py

-import turtle
+import turtle#导入库
+import random
+
+def tree(n):
+    if n >0:#判断条件
+        if n<=12:
+            pen.color(random.choice(["snow","lightcoral"]))
+            pen.pensize(n/3)
+        else:
+            pen.color("sienna")
+            pen.pensize(n/10)
+        pen.forward(n)
+        angle=random.randint(1,30)#随机角度
+        length=random.randint(1,15)#随机长度
+        pen.right(angle)
+        tree(n-length)
+        pen.left(2*angle)
+        tree(n-length)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+pen = turtle.Pen()
+pen.speed(0)
 
-pen = turtle.Turtle()
-pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
@@ -12,4 +33,10 @@ pen.up()
 pen.backward(150)    # 后退
 pen.down()
 
+#二叉树的实现
+tree(50)
+pen.up()
+pen.goto(150,-100)
+pen.write("樱花绽放",font=("宋体",40,"bold"))
+
 turtle.done()