提问人：Gustavo Saldan 提问时间：5/28/2023 更新时间：5/28/2023 访问量：48
我可以让变量在 If 语句中工作吗？[复制]
Can i make variables work within If statements? [duplicate]
问：
如何使此变量与python中的if语句一起使用？
arrived = input('Have the doorbell ringed?: ')
if arrived == 'yes' or 'Yes':
doorbell = input('Is it from ifood?: ')
elif arrived == 'no' or 'No':
print('It is not here yet, keep waiting')
else:
print('Please answer the first question with yes or no')
if doorbell == 'yes' or 'Yes':
print('Your ifood have arrived!!!')
elif doorbell == 'no' or 'No':
print('It is not your ifood yet, keep waiting')
else:
print('Please answer the questions with yes or no')
我是一个初学者，这是从练习开始的，我已经搜索了一段时间，我知道变量在 python 中是全局的，但有没有办法让它工作？
答：
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Erwin Kalvelagen
5/28/2023
#1
你错了。更好的是：if
if arrived == 'yes' or arrived == 'Yes':
或
if arrived in ['yes','Yes']:
评论
0赞
Gustavo Saldan
5/28/2023
第二个要求在逗号后留一个空格，但它对 IFS 有效，谢谢！
1赞
Erwin Kalvelagen
5/28/2023
第二个要求在逗号后留一个空格无法重现。
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Redz
5/28/2023
#2
首先，你的 if 语句是错误的 - 它需要包含第二个，否则它将不起作用。它应该看起来像这样。arrived ==
if arrived == 'yes' or arrived == 'Yes':
其次，您可能希望在第一个 if 语句中加入第二个 if-elif-else，因为只有在满足 if 语句条件时才应触发它。
完整解决方案：
arrived = input('Have the doorbell ringed?: ')
if arrived == 'yes' or arrived == 'Yes':
doorbell = input('Is it from ifood?: ')
if doorbell == 'yes' or 'Yes':
print('Your ifood have arrived!!!')
elif doorbell == 'no' or 'No':
print('It is not your ifood yet, keep waiting')
else:
print('Please answer the questions with yes or no')
elif arrived == 'no' or arrived == 'No':
print('It is not here yet, keep waiting')
else:
print('Please answer the first question with yes or no')
评论
0赞
Matthias
5/29/2023
或者做，只是要求.现在您可以输入“是”或“是”或“是”或“yeS”......arrived = input('Have the doorbell ringed?: ').lower()if arrived == 'yes':
评论
doorbell = None