试一试:除了:不适用于elif语句的子句？
试一试:除了:不适用于elif语句的子句？
提问于 2022-11-03 10:53:52
我正在学习Python课程的自动化内容，其中一个课程让我很困惑，关于try: and以外:子句的用法。
当我运行下面的课程中描述的代码时，使用if/one语句工作，因为执行了text子句，python在输入'one‘这样的文本时打印’您没有输入一个数字‘
print('how many cats do you have?')
numcats=input()
try:
if int(numcats)>=4:
print('that is a lot of cats')
else:
print('that is not many cats')
except ValueError:
print('you did not enter a number')但是，当我按照本例使用elif语句时，不会执行get子句，并且会得到一个错误。在我看来，他们俩看起来都应该产生同样的结果。
我遗漏了什么？
print('how many cats do you own?')
numcats=int(input())
try:
if numcats<=5 and numcats>0:
print('that is not alot of cats')
elif numcats >5 and numcats<=10:
print('that is alot of cats! more than five and less than 10!')
elif numcats <0:
print('you cant have less than zero cats!')
elif numcats>10:
print('more than 10 cats! thats crazy!')
except ValueError:
print('you did not enter a numerical value, try again')我比较了这两组代码的结构，看起来它们应该产生相同的结果，不知道为什么elif语句会导致not :子句不被执行？我以为这和如果，否则的声明是一样的
回答 4
Stack Overflow用户
回答已采纳
发布于 2022-11-03 10:56:20
产生ValueError的东西是将输入转换为整数(int(numcats)和int(input()))。在第一个示例中，您在try块中执行try之前的第二个步骤，因此错误不会被捕获。
将numcats=int(input())移动到try块中，这应该很好。
Stack Overflow用户
发布于 2022-11-03 11:01:12
您需要将int()转换放在try:块中。
就像这样：
while True:
try:
numcats = int(input('how many cats do you own? '))
break
except ValueError:
print('you did not enter a numerical value, try again')
if numcats <= 5 and numcats > 0:
print('that is not alot of cats')
elif numcats > 5 and numcats <= 10:
print('that is alot of cats! more than five and less than 10!')
elif numcats < 0:
print('you cant have less than zero cats!')
elif numcats > 10:
print('more than 10 cats! thats crazy!')Stack Overflow用户
发布于 2022-11-03 10:59:52
试一试：
print('how many cats do you own?')
numcats=input()
try:
if int(numcats)<=5 and int(numcats)>0:
print('that is not alot of cats')
elif int(numcats) >5 and int(numcats)<=10:
print('that is alot of cats! more than five and less than 10!')
elif int(numcats) <0:
print('you cant have less than zero cats!')
elif int(numcats)>10:
print('more than 10 cats! thats crazy!')
except ValueError:
print('you did not enter a numerical value, try again')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/74301916
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