save project

my_tree.py

+import turtle
+import random
+pen = turtle.Turtle()
+pen.color('sienna')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('wheat') 
+pen.up()
+pen.goto(0,-100) 
+pen.down()
+pen.left(90)    
+turtle.Turtle().screen.delay(0)
+pen.speed(99999999999999999)
+def tree(n):
+#
+    if n>=20:
+        pen.pensize(n/10)
+        pen.forward(n)
+        angle=random.randint(0,30)
+        length=random.randint(1,15)
+        pen.right(angle)
+        tree(n-length)
+        pen.left(angle*2)
+        tree(n-length)
+        pen.right(angle)
+        pen.up()
+        pen.backward(n)
+        pen.down()
+
+tree(80)
+turtle.done()