Python - 忽略字母大小写
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Python - Ignore letter case
提问by Hyman Anyon
I have an if statement:
我有一个 if 语句：
rules = input ("Would you like to read the instructions? ")
rulesa = "Yes"
if rules == rulesa:
print ("No cheating")
else: print ("Have fun!")
I wish for the user to be able to answer with Yes, YES, yES, yes or any other capitalisation, and for the code to know that they mean Yes.
我希望用户能够用 Yes、YES、yES、yes 或任何其他大写字母来回答，并且让代码知道它们的意思是 Yes。
采纳答案by Nikolai Saiko
For this simple example you can just compare lowercased ruleswith "yes":
对于这个简单的示例，您可以将小写rules与进行比较"yes"：
rules = input ("Would you like to read the instructions? ")
rulesa = "yes"
if rules.lower() == rulesa:
print ("No cheating")
else:
print ("Have fun!")
It is OK for many cases, but be awared, some languages may give you a tricky results. For example, German letter ?gives following:
在许多情况下都可以，但请注意，某些语言可能会给您带来棘手的结果。例如，德语字母?给出以下内容：
"?".lower() is "?"
"?".upper() is "SS"
"?".upper().lower() is "ss"
("?".upper().lower() == "?".lower()) is False
So we may have troubles, if our string was uppercased somewhere before our call to lower().
Same behaviour may also be met in Greek language. Read the post
https://stackoverflow.com/a/29247821/2433843for more information.
所以我们可能会遇到麻烦，如果我们的字符串在调用lower(). 在希腊语中也可能遇到相同的行为。阅读帖子
https://stackoverflow.com/a/29247821/2433843了解更多信息。
So in generic case, you may need to use str.casefold()function (since python3.3), which handles tricky cases and is recommended way for case-independent comparation:
因此，在一般情况下，您可能需要使用str.casefold()函数（自 python3.3 起），它处理棘手的情况，并且是独立于案例的比较的推荐方法：
rules.casefold() == rulesa.casefold()
instead of just
而不仅仅是
rules.lower() == rulesa.lower()
回答by gtlambert
Use the following:
使用以下内容：
if rules.lower() == rulesa.lower():
This converts both strings to lower case before testing for equality.
这会在测试相等之前将两个字符串转换为小写。
回答by juanchopanza
A common approach is to make the input upper or lower case, and compare with an upper or lower case word:
一种常见的做法是将输入大写或小写，并与大写或小写单词进行比较：
rulesa = 'yes'
if rules.lower() == rulesa:
# do stuff
回答by George Zachariadis
rules = raw_input("Would you like to read the instructions? ")
rulesa = "Yes"
if (rules == rulesa) or (rules.lower() == rulesa.lower()) or rules.upper() == rulesa.uppper():
print ("No cheating")
else: print ("Have fun!")
That will work everytime no matter the input and will keep the user's input as it was inputed! Have fun with it.
无论输入如何，这都会在每次输入时都有效，并且会保持用户输入的内容！玩得开心。
回答by Kunal Jain
You can make either of uppercase comparison or lowercase comparison.
您可以进行大写比较或小写比较。
For Example:
例如：
rulesa.upper() == rules.upper()
or
或者
rulesa.lower() == rules.lower()
both will give you output as true
两者都会给你输出为真
