顾客：那7是大写还是小写？
如果输入的字符是字母，则程序检查是大写还是小写。
Enter a character: 2the character is not an alphabetic character.
现在不管输入是大写还是小写，所有值都会经过以下代码序列进行处理
Now, all of your values, whether they are lowercase or not, will be processed through the following code sequence
god里面的字母g，我该写成小写还是大写？
我从来对大写字母就不感冒，不管是读还是敲键盘的时候，都看不惯它，所以在Python里关键字都是小写的。
I never got comfortable with the uppercase, neither reading nor typing it, so in Python keywords were lowercase.
任何情况下大写字母还是更大一些…但是大写字母和小写字母之间的对比通常都很难看。
In any cases capitals are bigger... But the appearance of a word in upper case between lower caps is usually ugly.
Shift +F3 大小写切换这个并非完美 —比如说，它在标题大写模式下坚持要把冠词和介词改为大写，不过还是帮我们节省了大量时间的。
Shift + F3 Toggles through capitalization options. This one isn’t perfect — for instance, it insists on capitalizing articles and prepositions in Title Case mode — but it’s still a big timesaver.
Shift +F3 大小写切换这个并非完美 —比如说，它在标题大写模式下坚持要把冠词和介词改为大写，不过还是帮我们节省了大量时间的。
Shift + F3 Toggles through capitalization options. This one isn’t perfect — for instance, it insists on capitalizing articles and prepositions in Title Case mode — but it’s still a big timesaver.
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