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在论坛上看完第五讲之后,小甲鱼讲到游戏改进的地方:用户输入错误类型时,题型用户重新输入,并提供了以下代码:
- temp = input("不妨猜一下小甲鱼现在心里想的是哪个数字:")
- # 这种想法是因为 type(1) 会返回 <class 'int'>,如果 type(temp) 返回结果一致说明输入是整数。
- while type(temp) != type(1):
- print("抱歉,输入不合法,", end='')
- temp = input("请输入一个整数:")
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我想把这段程序插入到以前写的程序中,结果出现了问题。以前的代码如下:
- import random
- secret = random.randint(1,10)
- temp = input('guess which number I am thinking of : ')
- guess = int(temp)
- times = 1
- while(guess != secret) and (times < 3):
- if guess > secret:
- print('oh,it\'s too big')
- else:
- print('oh, it\'s too small')
- temp = input('try again: ')
- guess = int(temp)
- times = times +1
- if (times <= 3) and (guess == secret):
- print('Are you a genius ? ')
- print('hng, there is no award even so')
- else:
- print('Well, game ove given you three times')
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插入之后,我把上面的代码修改如下:
- import random
- secret = random.randint(1,10)
- temp = input('guess which number I am thinking of : ')
- guess = int(temp)
- times = 1
- if isinstance(temp,int):
- while(guess != secret) and (times < 3):
- if guess > secret:
- print('oh,it\'s too big')
- else:
- print('oh, it\'s too small')
- temp = input('try again: ')
- guess = int(temp)
- times = times +1
- if (times <= 3) and (guess == secret):
- print('Are you a genius ? ')
- print('hng, there is no award even so')
- else:
- print('Well, game ove given you three times')
- else:
- print('抱歉,输入不合法,', end = ' ')
- temp = input('注意,请输入一个整数:')
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但是这样修改是不对的,正如小甲鱼所说, input() 的返回值始终是字符串,所以 type(temp) 永远是 <class 'str'>
我的问题是,怎样修改才能实现原来的功能?
- >>> n = "123"
- >>> n.isdigit()
- True
- >>> m = "abc"
- >>> m.isdigit()
- False
- >>>
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