save project

my_tree.py

-import turtle
-import random
-def tree(n):
-    if n >= 50:
-        pen.forward(n)
-        a = random.randint(0,30)
-        l = random.randint(1,15)
-        pen.right(a)
-        tree(n-l)
-        pen.left(2*a)
-        tree(n-l)
-        pen.right(a)
-        pen.up()
-        pen.backward(n)
-        pen.down()
-
-pen = turtle.Turtle()
-pen.color('sienna')
-# 画布大小
-w = turtle.Screen()
-w.bgcolor('wheat')      # wheat小麦
-
-# 移动到起点
-pen.left(90)
-pen.up()
-pen.backward(150)    # 后退
-pen.down()
-tree(100)
-turtle.done()
+num_list = [1,3,5,8,11,15,17,18,20,21]
+mid = (low+high)//2
+guess = num_list[mid]
+if guess == num:
+    print("找到了")
+elif guess < num:
+    low = mid + 1
+else:
+    high = mid - 1
\ No newline at end of file