Python variable names are case-sensitive, and you can't use certain Python keywords (such as if, else, while, def, or, and, not, in, and is, for starters) as variable names.

Python 变量名是区分大小写的，并且您不能使用特定的 Python 关键字（比如 if、else、while、def、or、and、not、in 和 is 开始符）作为变量名。

youdao

You must precede all options (unless otherwise noted) with either a dash (-) or a slash (/). The options are not case sensitive. Therefore, the following options are all identical: -d /d -D /D.

你必须在每一个选项前面添加”-“或”/”，除非有其它的说明。选项是不区分大小写的，因此，以下两组命令是相同的：-d /d -D /D。

youdao

Please do not use Spaces or punctuation. Usernames are case sensitive.

请不要使用空格或标点符号。用户名是不区分大小写的。

youdao

But, says the government, in some cases the evidence has been gathered in ways that makes it inadmissible in court, and in other cases, although the security services are sure that the suspects are involved in worrying activities, there is not enough evidence to make a convincing case against them, or the evidence is so sensitive that it cannot be presented in open court.

ECONOMIST: Terror suspects in Britain