save project

my_tree.py

+import turtle
+def tree(n):
+    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()
+# 创建画笔 pen
+pen=t.Pen()
+# 设置画笔颜色为'sienna'
+pen.pencolor('sienna')
+pen.speed(0)
+# 创建画布
+screen=t.Screen()
+# 设置画布颜色为'wheat'
+screen.bgcolor('wheat')
+# 设置起点 先向左旋转90
+pen.left(90)
+# 抬笔
+pen.penup()
+# 向后移动150步
+pen.backward(150)
+# 落笔
+pen.pendown()
+# 调用函数tree
+tree(60)
+# 结束运行
+t.done()
\ No newline at end of file