save project

my_tree.py

-import turtle
-import random
+bingo_num=20
+num_list = [1,3,5,8,11,15,17,18,20,21]
+low = 0
+high = len(num_list)-1
 
-pen = turtle.Turtle()
-pen.color('sienna')
-pen.speed(0)
-# 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()
-def tree(n):
-    if n>=0:
-        if n<=12:
-            color_lits=['snow','lightcoral']
-            color=random.choice(color_lits)
-            pen.color(color)
-            pen.pensize(n/3)
-        else:
-            pen.color('sienna')
-            pen.pensize(n/10)
-        pen.forward(n)
-        angle=random.random()
-        pen.right(30*angle)
-        length=1.5*random.random()
-        tree(n-10*length)
-        pen.left(60*angle)
-        tree(n-10*length)
-        pen.right(30*angle)
-        pen.up()
-        pen.backward(n)
-        pen.down()
-tree(60)
-turtle.done()
+
+while low <= high:
+    mid = (low+high) // 2
+    guess_num = num_list[mid]
+    if guess_num == bingo_num:
+        print("找到了，他在列表里的索引是：",mid)
+        break
+    elif guess_num < bingo_num:
+        low = mid+1
+    elif guess_num > bingo_num:
+        high = mid-1
\ No newline at end of file