save project

my_tree.py

 import turtle
-
+import random
+color=['snow','lightcoral']
+def tree(n):
+    if n>=0:
+        angle=random.randint(1,20)
+        length=random.randint(1,10)
+        if n <=12:
+            pen.color(color[random.randint(0,1)])
+            pen.pensize(n/3)
+        else:
+            pen.color('sienna')
+            pen.pensize(n/10)
+        pen.forward(n)
+        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.speed(100)
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
+pen.backward(150)    
 pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.backward(50)
-pen.left(60)
-pen.forward(50)
-
+tree(50)
 turtle.done()
\ No newline at end of file