save project

my_tree.py

 import turtle
 
+
+
 pen = turtle.Turtle()
 pen.color('sienna')
+pen.pensize(3)
 # 画布大小
 w = turtle.Screen()
 w.bgcolor('wheat')      # wheat小麦
@@ -9,7 +12,34 @@ w.bgcolor('wheat')      # wheat小麦
 # 移动到起点
 pen.left(90)
 pen.up()
-pen.backward(150)    # 后退
-pen.down()
+pen.backward(150)
+pen.down()    # 后退
+
+
+def tree(n):
+    if n>=50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-50)
+        pen.left(30)
+        pen.left(30)
+        tree(n-50)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
+        pen.down()
 
+# pen.down()
+# pen.forward(150)
+# pen.right(30)
+# pen.forward(100)
+# pen.up()
+# pen.backward(100)
+# pen.down()
+# pen.left(60)
+# pen.forward(100)
+# pen.up()
+# pen.backward(100)
+# pen.down()
+tree(100)
 turtle.done()