positional-parameter | 易学教程

Python parameter list with single argument

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问题 When testing Python parameter list with a single argument, I found some weird behavior with print . >>> def hi(*x): ... print(x) ... >>> hi() () >>> hi(1,2) (1, 2) >>> hi(1) (1,) Could any one explain to me what the last comma mean in hi(1) 's result (i.e. (1,) ) 回答1: Actually the behavior is only a little bit "weird." :-) Your parameter x is prefixed with a star, which means all the arguments you pass to the function will be "rolled up" into a single tuple, and x will be that tuple. The

Positional before Named argument list parsing

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问题 How would you do that in the parser combinators def namedAfterPos[P, N](pos: Parser[P], nmd: Parser[N], sep: Parser[_] = ",") = ??? List("a", "a,a,a", "a,a,a=b,a=b", "a=b, a=b") map (_ parseWith namedAfterPos("a", "a=b")) map {case Success(res, _) => res} val Failure("positional is not expected after named", pos) = "a,a=b,a" parseWith namedAfterPos("a", "a=b") 回答1: Ok, here is mind approach scala> def namedAfterPos[P, N](pos: Parser[P], nmd: Parser[N], sep: Parser[_] = ",") = { // NB! http:/

Positional Parameter error in powershell script

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I was trying to install/update EPO agent through PowerShell, but I am getting below error. I am new to PowerShell so I am not able to see what is causing this. Below is the script I used to update the agent : Start-Process -FilePath $scriptpath "\INAEPO01_Framepkg.exe" "/FORCEINSTALL" "/INSTALL=AGENT" -Wait Error : Positional parameter cannot be found that accepts argument /FORCEINSTALL. Try it like that, i.e. add commas between the arguments so that they form an array Start-Process -FilePath $scriptpath "\INAEPO01_Framepkg.exe","/FORCEINSTALL", "/INSTALL=AGENT" -Wait or to be more explicit

Positional Parameter error in powershell script

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问题 I was trying to install/update EPO agent through PowerShell, but I am getting below error. I am new to PowerShell so I am not able to see what is causing this. Below is the script I used to update the agent : Start-Process -FilePath $scriptpath "\INAEPO01_Framepkg.exe" "/FORCEINSTALL" "/INSTALL=AGENT" -Wait Error : Positional parameter cannot be found that accepts argument /FORCEINSTALL. 回答1: Try it like that, i.e. add commas between the arguments so that they form an array Start-Process