save project

my_tree.py

+import turtle
+import random
+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')      # wheat小麦
+#移动到起点
+pen.left(90)
+pen.up()
+pen.backward(150)   #后退
+pen.down()
+tree(60)
+turtle.done()
\ No newline at end of file