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问题 When I try to run pip in the Windows Command Prompt, pip -V works fine, but when I try to run it in PyCharm terminal I get 'pip' is not recognized as an internal or external command, operable program or batch file. My Path environmental variables are set for: C:\Users\username\AppData\Local\Programs\Python\Python37\Scripts\ C:\Users\username\AppData\Local\Programs\Python\Python37\ C:\Users\username\AppData\Roaming\Python\Python37\Scripts\ C:\Users\username\AppData\Roaming\Python\Python37\ The

问题 I have recently begun using knitr with Rstudio. I ran into the "No tex installation detected. Please install TeX before compiling." error in both my Ubuntu and windows OS's. After some research I was able to amend the issue in Ubuntu by adding the directory of my tex installation to PATH . I did this by including the following line in Renviron.site PATH=/usr/local/texlive/2013/bin:${PATH} However, the issue remains for my windows installation. I was unable to find the Renviron.site file, so I

问题 I have recently begun using knitr with Rstudio. I ran into the "No tex installation detected. Please install TeX before compiling." error in both my Ubuntu and windows OS's. After some research I was able to amend the issue in Ubuntu by adding the directory of my tex installation to PATH . I did this by including the following line in Renviron.site PATH=/usr/local/texlive/2013/bin:${PATH} However, the issue remains for my windows installation. I was unable to find the Renviron.site file, so I

问题 I am getting some strange behavior when trying to convert between Files and URLs, particularly when a file/path has spaces in its name. Is there any safe way to convert between the two? My program has a file saving functionality where the actual "Save" operation is delegated to an outside library that requires a URL as a parameter. However, I also want the user to be able to pick which file to save to. The issue is that when converting between File and URL (using URI), spaces show up as "%20"

问题 If I have a closed path, I can use Geometry.GetArea() to approximate the area of my shape. This is great and saves me a lot of time. But is there anything around that will help me find the length of a unclosed path? The best I've been able to come up with for now is to make sure I am using PathGeometry and call the GetPointAtFractionLength method multiple times, get the points and add up the distance between all those points. Code: public double LengthOfPathGeometry(PathGeometry path, double

问题 I want to draw a curved line between two markers (something like Uber) but there's no method for doing that. is there any idea? 来源： https://stackoverflow.com/questions/49189242/draw-a-curved-line-by-gmspolyline-google-maps-ios-sdk

问题 I was trying to run npm from a PHP web page, but it would never run. I always got an exit code of 127 and no output. After doing some testing I narrowed down the problem to the shebang in npm which looks like this: #!/usr/bin/env node Pretty standard, but I did up some test code: <?php $result = exec("/usr/bin/env node --version", $output, $exit); var_dump($result); var_dump($exit); $result = exec("node --version", $output, $exit); var_dump($result); var_dump($exit); $result = exec("/usr/bin

问题 How can I determine the maximum filename length on a linux box? Preferred in PHP programming language. 回答1: You want pathconf or fpathconf, which are not exposed (yet) in PHP. (When they are, they'll probably be posix_pathconf .) You may also shell out to getconf, a command-line utility interface to the same functionality. Try this on your system: $ getconf NAME_MAX /tmp $ getconf PATH_MAX /tmp 回答2: there's no need to programatically determine it. it's 255 bytes. edit: you can have longer

问题 How can I determine the maximum filename length on a linux box? Preferred in PHP programming language. 回答1: You want pathconf or fpathconf, which are not exposed (yet) in PHP. (When they are, they'll probably be posix_pathconf .) You may also shell out to getconf, a command-line utility interface to the same functionality. Try this on your system: $ getconf NAME_MAX /tmp $ getconf PATH_MAX /tmp 回答2: there's no need to programatically determine it. it's 255 bytes. edit: you can have longer

问题 Native build of ViM on Windows uses backslashes in file paths including for completion, though it works fine if I use forward slashes manually (in fact all Windows API understand them, cmd.exe is the only exception) and backslashes cause various problems, because they double as escape and the "dwim" logic does not really work. For example: :vimgrep /Foo/ src/* works just fine, but :vimgrep /Foo/ src\* does not, because the \ escapes the * . Manually I just write forward slash, but tab