escaping

问题 I've checked this solution but it doesn't work in python3. I've an escaped string of this kind: str = "Hello\\nWorld" and I want to obtain the same string unescaped: str_out = Hello\nWorld I tried with this without succes: AttributeError: 'str' object has no attribute 'decode' Here my sample code: str = "Hello\\nWorld" str.decode('unicode_escape') 回答1: decode applies to bytes , which you can create by encoding from your string. I would encode (using default) then decode with unicode-escape >>

问题 Expected: >>> print "I print\b\b Backspace\b\b!" I pri Backspa! >>> print "I print\b\b Backspace\b\b\b!" I pri Backsp! Observed: >>> print "I print\b\b Backspace\b\b!" I pri Backspa!e >>> print "I print\b\b Backspace\b\b\b!" I pri Backsp!ce Why does is 'e' and 'ce' not erased and '!' inserted? 回答1: The \b also termed as back space moves back the cursor by 1. The backspace doesn't delete anything, it moves the cursor to the left and it gets covered up by what you write afterwards. Let's

问题 Expected: >>> print "I print\b\b Backspace\b\b!" I pri Backspa! >>> print "I print\b\b Backspace\b\b\b!" I pri Backsp! Observed: >>> print "I print\b\b Backspace\b\b!" I pri Backspa!e >>> print "I print\b\b Backspace\b\b\b!" I pri Backsp!ce Why does is 'e' and 'ce' not erased and '!' inserted? 回答1: The \b also termed as back space moves back the cursor by 1. The backspace doesn't delete anything, it moves the cursor to the left and it gets covered up by what you write afterwards. Let's

问题 I want to create a bat file with set variables from another bat file. This is for a startup .bat file that maps network drives and copies some files to the local computer and looks at the system services that needs to run. It also needs to create a log file every time the logon .bat file runs. Here is a sample what I have done. ECHO set SERVER IP=>>"V:\GENESIS\GENESIS INSTALL FILES\GenesisLogonUser.bat" ECHO set DRIVE1=V>>"V:\GENESIS\GENESIS INSTALL FILES\GenesisLogonUser.bat" ECHO set

问题 I want to create a bat file with set variables from another bat file. This is for a startup .bat file that maps network drives and copies some files to the local computer and looks at the system services that needs to run. It also needs to create a log file every time the logon .bat file runs. Here is a sample what I have done. ECHO set SERVER IP=>>"V:\GENESIS\GENESIS INSTALL FILES\GenesisLogonUser.bat" ECHO set DRIVE1=V>>"V:\GENESIS\GENESIS INSTALL FILES\GenesisLogonUser.bat" ECHO set

问题 I am trying to write one batch file from another, using echo . However, there is one line with special characters that I cannot work out how to write. I have the following line: echo >nul 2>&1 "%SYSTEMROOT%\system32\cacls.exe" "%SYSTEMROOT%\system32\config\system" >> "c:\ProgramData\Microsoft\Windows\Start Menu\Programs\StartUp\OrchestrationCleanUp.bat" But what gets written to the target file is: "C:\Windows\system32\cacls.exe" "C:\Windows\system32\config\system" It should be: >nul 2>&1 "

问题 Please see these simple commands: $ echo $tmp UY\U[_ $ echo "a" | sed "s|a|${tmp}|g" UY[_ The \U is eaten. Other backslashes won't survive either. How can I make the above command work as expected? 回答1: If it's only backslash that is "eaten" by sed and escaping just that is enough, then try: echo "a" | sed "s|a|${tmp//\\/\\\\}|g" Confusing enough for you? \\ represents a single \ since it needs to be escaped in the shell too. The inital // is similar to the g modifier in s/foo/bar/g , if you

问题 Please see these simple commands: $ echo $tmp UY\U[_ $ echo "a" | sed "s|a|${tmp}|g" UY[_ The \U is eaten. Other backslashes won't survive either. How can I make the above command work as expected? 回答1: If it's only backslash that is "eaten" by sed and escaping just that is enough, then try: echo "a" | sed "s|a|${tmp//\\/\\\\}|g" Confusing enough for you? \\ represents a single \ since it needs to be escaped in the shell too. The inital // is similar to the g modifier in s/foo/bar/g , if you

问题 Suppose I have a file abc.txt which contains line ab*cd . When I grep that pattern ab*cd with quotes but without escaping the asterisk it does not work: > grep ab*c abc.txt > grep "ab*c" abc.txt > grep 'ab*c' abc.txt When I use both quotes and escaping it does work > grep "ab\*c" abc.txt ab*cd > grep 'ab\*c' abc.txt ab*cd Now I wonder why the quotes do not work and if I can use only quotes without escaping the asterisk. 回答1: Use the flag -F to search for fixed strings -- instead of regular

问题 This question already has answers here : Escape characters in Matlab (2 answers) Closed 2 years ago . I am reading a file using fileread() which returns me the entire file. Now I need to read line by line and convert them into process the data. Can I know how I would be able to detect the newline character in Matlab? I tried '\n' and '\r\n' and it doesn't work. Thanks in advance 回答1: I already replied here (please avoid posting the question twice)Escape characters in Matlab For special