save project

my_tree.py

@@ -12,4 +12,28 @@ pen.up()
 pen.backward(150)    # 后退
 pen.backward(150)    # 后退
 pen.down()
 pen.down()
 
 
+def tree(n):
+
+    pen.forward(n)
+    pen.left(30)
+    if n > 50:
+        tree(n - 10)
+    pen.right(60)
+    if n > 50:
+        tree(n - 10)
+    pen.left(30)
+    pen.up()
+    pen.backward(n)
+    pen.down()
+
+
+tree(100)
+# pen.right(30)
+# pen.forward(50)
+# pen.up()
+# pen.backward(50)
+# pen.left(30)
+# pen.backward(100)
+# pen.down()
+
 turtle.done()
 turtle.done()