如何根据我的程序中用户的输入给出一个错误信息？
如何根据我的程序中用户的输入给出一个错误信息？
提问于 2016-08-04 21:43:06
所以我用Python写了一个电动比尔计算器。好消息是它起作用了！然而，我需要使它更好地工作。当被问到每天有多少小时时，用户可以输入25个小时，或者输入他们想要的任何其他数字。很明显一天不会有25个小时。我试过几件事，但我不能让它正常工作。
我试过这样的方法：
hours = input("How many hours per day? ")
if hours > 24:
print("Don't be silly, theres not more than 24 hours in a day ")
else:
main()我要做的是，让程序显示一个错误信息，如果输入超过24小时，如果输入超过24小时，那么跳到下面的代码，询问他们是否想尝试另一种计算。如果他们进入24小时或更短的时间，然后继续程序，没有错误信息。我花了大约两天的时间来修复这个问题，在谷歌搜索了几个小时，我可能已经找到了正确的答案，但似乎无法让它发挥作用。我想我需要一些时间真实的陈述，或者如果；那么，但是，尽管我已经试过很多次，我在这一点上还是在拔出我的头发。整个程序的代码如下：
def main():
star = '*' * 70
print star
print ("Nick's Electric Bill Calculator")
print star
watts = input("Enter the watts of appliance, or total watts of appliances ")
hours = input("Enter the number of hours that appliance(s) run per day ")
cost = input("Enter the cost in cents per KwH you pay for electricty " )
# print ("Don't be silly, there isn't more than 24 hours in a day!")
x = (watts * hours / 1000.0 * 30) * cost
total = x
print star
print ("""If you use %s watts of electricity for %s hours per day, at a cost of
%s cents per Kilo-watt hour, you will add $%s to your monthly
electric bill""") % (watts, hours, cost, total)
print star
playagain = 'yes'
while playagain == 'yes':
main()
print('Would you like to do another Calculation? (yes or no)')
playagain = raw_input()我刚开始编程，我只学了几个星期的Python，非常感谢你的建议。
回答 4
Stack Overflow用户
回答已采纳
发布于 2016-08-04 21:56:06
@JamesRusso代码的优化版本：
def main():
star = '*' * 70
print star
print ("Nick's Electric Bill Calculator")
print star
watts = int(input("Enter the watts of appliance, or total watts of appliances"))
hours = int(input("Enter the number of hours that appliance(s) run per day"))
# Check that the hours number is good before getting to the cost
while (hours > 24) or (hours < 0):
print("Don't be silly, theres not more than 24 or less than 0 hours in a day ")
hours = int(input("Enter the number of hours that appliance(s) run per day "))
cost = int(input("Enter the cost in cents per KwH you pay for electricty "))
# We don't need an auxiliary variable x here
total = (watts * hours / 1000.0 * 30) * cost
print star
print ("""If you use %s watts of electricity for %s hours per day, at a cost of %s cents per Kilo-watt hour, you will add $%s to your monthly electric bill""") % (watts, hours, cost, total)
print star
if __name__ == '__main__':
playagain = 'yes'
while playagain == 'yes':
main()
print 'Would you like to do another Calculation? (yes or no)'
playagain = raw_input()
# Checking that the user's input is whether yes or no
while playagain not in ['yes', 'no']:
print "It's a yes/no question god damn it"
print 'Would you like to do another Calculation? (yes or no)'
playagain = raw_input()Stack Overflow用户
发布于 2016-08-04 21:46:01
我将您的错误消息放在if状态中，计算代码放在其他状态中。这样，当时间不正确时，它就不会进行计算，而是退出main，回到while循环，询问用户是否愿意再次播放。另外，正如其他用户所指出的，按照我下面所做的，您应该添加更多的错误测试和负数信息，等等。
def main():
star = '*' * 70
print star
print ("Nick's Electric Bill Calculator")
print star
watts = input("Enter the watts of appliance, or total watts of appliances ")
hours = input("Enter the number of hours that appliance(s) run per day ")
cost = input("Enter the cost in cents per KwH you pay for electricty " )
if hours > 24:
print("Don't be silly, theres not more than 24 hours in a day ")
else:
x = (watts * hours / 1000.0 * 30) * cost
total = x
print star
print ("""If you use %s watts of electricity for %s hours per day, at a cost of %s cents per Kilo-watt hour, you will add $%s to your monthly electric bill""") % (watts, hours, cost, total)
print star
playagain = 'yes'
while playagain == 'yes':
main()
print('Would you like to do another Calculation? (yes or no)')
playagain = raw_input()Stack Overflow用户
发布于 2016-08-04 21:47:27
您从用户获得的输入是string类型，但您可以将其与int类型进行比较。这是个错误。您应该首先将string转换为int：
hours = int(input("How many hours per day? "))
# ----^---然后你就可以做这样的事情：
while hours > 24:
print("Don't be silly, theres not more than 24 hours in a day ")
hours = int(input("How many hours per day? "))如果您不确定用户是否会输入一个数字，则应该使用try/catch状态器。
除此之外，您应该正确地验证代码缩进。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/38777883
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