save project

my_tree.py

+import turtle
+
+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()
+def darw_tree(n,lenth):
+    if n==1:
+      pen.forward(lenth)
+      pen.backward(lenth)
+    else:
+        pen.forward(lenth)
+        pen.right(30)
+        darw_tree(n-1,lenth/1.2)
+        pen.left(60)
+        darw_tree(n-1,lenth/1.2)
+        pen.right(30)
+        pen.backward(lenth)
+
+darw_tree(5,150)
+turtle.done()