为什么使用“\”在 jython 中显示错误
我正在尝试使用 Windows 的复制命令，并且我们有诸如 c:\oracle 之类的目录。
在尝试执行此类操作时，我们收到以下错误：
source_file=folder+"\"
^
SyntaxError: Lexical error at line 17, column 23. Encountered: "\r" (13), after : ""
Here 文件夹是我的 c:\oracle 路径，并且在尝试向其中添加文件时，如下所示：
source=folder+"\"+src_file
我无法这样做。关于如何解决这个问题有什么建议吗？
我尝试使用 / 但我的复制窗口在 os.command 中调用源代码时出现“语法不正确”，这是解决该问题的唯一方法是使用 \ 但这样做时出现上述错误。
请建议。感谢您的帮助
谢谢。
I am trying to use a copy command for Windows and we have directories such as c:\oracle.
While trying to execute one such, we get the following error:
source_file=folder+"\"
^
SyntaxError: Lexical error at line 17, column 23. Encountered: "\r" (13), after : ""
Here folder is my path of c:\oracle and while trying to add file to it like:
source=folder+"\"+src_file
I am not able to do so. Any suggestion on how to solve this issue?
I tried with / but my copy windows calling source in os.command is getting "the syntax is incorrect" and the only way to solve it is to use \ but I am getting the above error in doing so.
Please suggest. Thanks for your help
Thanks.
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简短回答：
您需要：
详细回答：
问题在于
\是转义字符。在这种特殊情况下，它所做的是转义"，以便将其视为字符串的字符而不是字符串终止符，类似于：会出现相同的问题。
换句话说，您'尝试构造一个由
"、其他一些文本和行尾（\r，回车符）组成的字符串。这就是你的错误的来源：Short answer:
You need:
Long answer:
The problem with
is that
\is the escape character. What it's doing in this particular case is escaping the"so that it's treated as a character of the string rather than the string terminator, similar to:which would have the same problem.
In other words, you're trying to construct a string consisting of
", some other text and the end of line (\r, the carriage return character). That's where your error is coming from:Paxdiablo 对于为什么 \ 不适合你是绝对正确的。但是，您也可以通过使用 os.path.normpath 来解决问题，而不是尝试自己构建正确的特定于平台的路径字符。
Paxdiablo is absolutely correct about why \ isn't working for you. However, you could also solve your problem by using
os.path.normpathinstead of trying to construct the proper platform-specific path characters yourself.在我所知道的所有编程语言中，您不能在字符串中放入引号，如下所示：
"this is a quote: "."这样做的原因是第一个引号打开字符串，然后第二个将其关闭（！），然后第三个打开另一个字符串 - 存在以下两个问题：有两种常见的机制可以解决这个问题：加倍和转义更为常见，这意味着您可以在不需要的字符前面放置一个特殊字符（通常是
\）。因此，"no, *this* is a quote: \"."是一个正确的字符串，其中引号 #2 没有关闭字符串 - 和字符。\不会出现。但是，现在您遇到了另一个问题 - 如何真正使转义字符出现在字符串中？很简单：逃离它！
“This is an escape: \\!”是如何做到的：反斜杠 #1 是转义字符，反斜杠 #2 是转义符：它不会用通常的转义来解释语义，但作为简单的反斜杠字符。因此，你的台词应该这样说：
顺便说一句：同时支持@paxdiablo（他在我的谩骂之前就加入了）和@Nick（他有一种正确的 Pythonic 方式来做你想做的事情）
In all programming languages I know of, you can't put a quote inside a string like this:
"this is a quote: "."The reason for this is that the first quote opens the string, the second then closes it (!), and then the third one opens another string - with the following two problems:There are two common mechanisms of solving this: doubling and escaping. Escaping is far more common, and what it means is you put a special character (usually
\) in front of characters that you don't want to be interpreted in their usual value. Thus,"no, *this* is a quote: \"."is a proper string, where the quote #2 is not closing the string - and the character\does not appear.However, now you have another problem - how do you actually make the escape character appear in a string? Simple: escape it!
"This is an escape: \\!"is how you do it: the backslash #1 is the escape character, and the backslash #2 is the escapee: it will not be interpreted with its usual escape semantics, but as a simple backslash character.Thus, your line should say this:
BTW: upvote for both @paxdiablo (who got in before my diatribe) and @Nick (who has a proper Pythonic way to do what you want to do)