save project

diy1.py

-#定义一个函数sum_numbers()
-#要求这个函数能接收一个名为num的整型参数
-#要求这个函数能计算1+2+3+……+num的结果
+import turtle
 
 
-def sun_numbers(num):
-    if num == 1:  
-        return 1
+pen = turtle.Turtle()
+pen.color('sienna')
+w = turtle.Screen()
+w.bgcolor('wheat')
 
 
-        temp = sun_numbers(num - 1)
-        return num + temp
-result = sun_numbers(100)
-print(result)
+pen.left(90)
+pen.up()
+pen.backward(150)
+pen.down()
 
 
+def tree(n):
+    if n >= 50:
+        pen.forward(n)
+        pen.right(30)
+        tree(n-50)
+        pen.left(60)
+        tree(n-50)
+        pen.right(30)
+        pen.up()
+        pen.backward(n)
         
         
+
+
+
+turtle.done()
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