python知识点（3）——AI猜数字，经典小题目

# 三、猜数字的AI
#
# 和猜数字一样，不过这次是设计一个能猜数字的AI
#
# 功能描述：用户输入一个单位以内的数字，AI要用最少的次数猜中，并且显示出猜的次数和数字。
# -*- coding: utf-8 -*-
"""
:author: lihui
:website: withlihui.com
Let computer guess a number
"""

while True:
    try:
        num = int(input('Enter a number: '))
    except ValueError:
        print ("The input must be a integer!")
        continue
    break

guess = num / 2
middle = num / 4
step = 0

while guess != num:
    if num > guess:
        guess += middle
        print ("I gusee: ", guess)
    elif num < guess:
        guess -= middle
        print ("I gusee: ", guess)
    middle /= 2
    if middle == 0:
        middle = 1
    step += 1

print ("Aha! The answer is: ", guess)

print ("I totally use %d steps." % step)

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