save project

my_tree.py

-import turtle
-import random
-
-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_list = ['snow','lightcoral']
-           color = random.choice(color_list)
-           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()
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+bingo_num = 20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low = 0
+high = len(num_list)-1
+while low <= high:
+   mid = (low+high) // 2
+   guess_num = num_list[mid]
+   if guess_num == bingo_num:
+      print("找到了:", mid)
+      break
+   elif guess_num < bingo_num:
+      low = mid+1
+   elif guess_num > bingo_num:
+      high = mid-1
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