save project

my_tree.py

 import turtle
+import random
+
+def tree(n):
+    if n>=0:
+        if n <=12:
+            q=['snow','lightcoral']
+            color=random.choice(q)
+            pen.color(color)
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')    
+            pen.pensize(n/10)
+            angle= random.random()
+            pen.right(30*angle)
+            length=1.5*random.random()
+        pen.forward(n)
+        angle = random.randint(0,30)
+        length = random.randint(1,15)
+        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.Turtle()
 pen.color('sienna')
 # 画布大小
 w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
-# 移动到起点
+w.bgcolor('wheat')
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)     
 pen.down()
+tree(60)
 
-turtle.done()
+  
+turtle.done()
\ No newline at end of file