backslash

问题 I tried to play with Strawberry Perl, and one of the things that stumped me was reading the files. I tried to do: open(FH, "D:\test\numbers.txt"); But it can not find the file (despite the file being there, and no permissions issues). An equivalent code (100% of the script other than the filename was identical) worked fine on Linux. 回答1: As per Perl FAQ 5, you should be using forward slashes in your DOS/Windows filenames (or, as an alternative, escaping the backslashes). Why can't I use "C:

问题 I tried to play with Strawberry Perl, and one of the things that stumped me was reading the files. I tried to do: open(FH, "D:\test\numbers.txt"); But it can not find the file (despite the file being there, and no permissions issues). An equivalent code (100% of the script other than the filename was identical) worked fine on Linux. 回答1: As per Perl FAQ 5, you should be using forward slashes in your DOS/Windows filenames (or, as an alternative, escaping the backslashes). Why can't I use "C:

问题 I tried to play with Strawberry Perl, and one of the things that stumped me was reading the files. I tried to do: open(FH, "D:\test\numbers.txt"); But it can not find the file (despite the file being there, and no permissions issues). An equivalent code (100% of the script other than the filename was identical) worked fine on Linux. 回答1: As per Perl FAQ 5, you should be using forward slashes in your DOS/Windows filenames (or, as an alternative, escaping the backslashes). Why can't I use "C:

问题 For example, t = str.encode(msg) print(t) I am getting the double slashes. b'\\xda\\xad\\x94\\xb4\\x0bg\\x92]R\\x9a1y\\x9d\\xed\\x04\\xd5\\x8e+\\x07\\xf8\\x03\\x1bm\\xd6\\x96\\x10\\xca80\\xe26\\x8a I would like to get the result as b'\xda\xad\x94\xb4\x0bg\x92]R\x9a1y\x9d\xed\x04\xd5\x8e+\x07\xf8\x03\x1bm\xd6\x96\x10\xca80\xe26\x8a' Any help would be appreciated. 回答1: You can't do that because '\\' represent a slash, not a double slash. For example, if you will convert the msg to a string and

问题 I need to change "/" into "\" in my R code. I have something like this: tmp <- paste(getwd(),"tmp.xls",sep="/") so my tmp is c:/Study/tmp.xls and I want it to be: c:\Study\tmp.xls Is it possible to change it in R? 回答1: Update as per comments. If this is simply to save the file, then as @sgibb suggested, you are better off using file.path() : file.path(getwd(), "tmp.xls") Update 2: You want double back-slashes. tmp is a string and if you want to have an actual backslash you need to escape it -

问题 I have a little program which is used to print the backslash symbol to the PDF file. In most English OS a backslash is displayed as a backslash, and my program works just fine. However, in Japanese OS or Korean OS my program starts to have problem. In those OS, a backslash is displayed as a YEN or WON symbol, but my program exports them as a backslash. I know that this is a bug of the font which has been around but i still want to find a solution for it. Does anyone know how to tell if my

问题 I don't understand the logic in the functioning of the scape operator \ in python regex together with r' of raw strings. Some help is appreciated. code: import re text=' esto .es 10 . er - 12 .23 with [ and.Other ] here is more ; puntuation' print('text0=',text) text1 = re.sub(r'(\s+)([;:\.\-])', r'\2', text) text2 = re.sub(r'\s+\.', '\.', text) text3 = re.sub(r'\s+\.', r'\.', text) print('text1=',text1) print('text2=',text2) print('text3=',text3) The theory says: backslash character ('\') to

问题 I don't understand the logic in the functioning of the scape operator \ in python regex together with r' of raw strings. Some help is appreciated. code: import re text=' esto .es 10 . er - 12 .23 with [ and.Other ] here is more ; puntuation' print('text0=',text) text1 = re.sub(r'(\s+)([;:\.\-])', r'\2', text) text2 = re.sub(r'\s+\.', '\.', text) text3 = re.sub(r'\s+\.', r'\.', text) print('text1=',text1) print('text2=',text2) print('text3=',text3) The theory says: backslash character ('\') to

问题 I make MathJax work with WordPress by adding the following code to footer.php . It works for simple math symbols and equations. <script type="text/x-mathjax-config"> MathJax.Hub.Config({ tex2jax: { inlineMath: [ ['$','$'], ["\\(","\\)"] ], processEscapes: true } }); </script> <script type="text/javascript" src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script> But it doesn't work for the equations with multiline, such as, It is rendered as one line as

问题 I'm trying to understand why the command below doesn't work (output is empty): echo 'aaa\tbbb' | awk -F '\\t' '{print $2}' I would expect the output to be 'bbb'. Interestingly this works (output is 'bbb'): echo 'aaa\tbbb' | awk -F 't' '{print $2}' And this works as well (ouptut is 'tbbb'): echo 'aaa\tbbb' | awk -F '\\' '{print $2}' It looks as if \\\t is read as backslash followed by tab instead of escaped backslash followed by t . Is there a proper way to write this command? 回答1: You need to