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my_tree.py

@@ -5,19 +5,17 @@ pen.color('sienna')
 # 画布大小
 # 画布大小
 w = turtle.Screen()
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
 w.bgcolor('wheat')      # wheat小麦
-
-# 移动到起点
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
-pen.forward(100)
-pen.right(30)
-pen.forward(50)
-pen.backward(50)
-pen.left(60)
-pen.forward(50)
-pen.backward(50)
-pen.right(30)
-pen.backward(100)
+def tree(a):
+ if a>=50: 
+        
+    pen.forward(a)
+    pen.backward(a)
+    pen.left(60)
+    tree(a-10)
+    pen.forward(a)
+    pen.backward(a)
+    pen.right(30)
+    tree(a-10)
+    pen.backward(a)
+tree(100)
 turtle.done()
 turtle.done()