save project

my_tree.py

+import turtle
+
+pen = turtle.Turtle()
+pen.color('teal')
+# 画布大小
+w = turtle.Screen()
+w.bgcolor('lightcyan')      # wheat小麦
+
+# 移动到起点
+pen.speed(10)
+pen.left(90)
+pen.up()
+pen.backward(150)  
+ # 后退
+def tree(n): 
+    if n>=50:
+        pen.down()
+        pen.forward(n)
+        pen.right(30)        
+        pen.forward(n-10)
+        pen.up()
+        pen.backward(n-10)
+        tree(n-10)
+        # pen.up()
+        # pen.backward(n-10)
+        #tree(n-10)
+        pen.down()
+        # pen.backward(n-10)
+        pen.left(60)
+        pen.forward(n-10)
+        pen.up()
+        pen.backward(n-10)
+        tree(n-10)
+        # pen.up()
+        # pen.backward(n-10)
+        pen.right(30)
+        pen.backward(n)
+        #tree(n-10)
+        
+        # pen.down()
+        # pen.left(60)
+        # pen.forward(n-10)
+        # pen.left(30)
+        
+        
+        # pen.backward(n-10)
+        # # pen.right(30)
+        # pen.backward(100)
+tree(100)
+turtle.done()