Ok, I thought only about Windows where people often use shell=True. I did not see that as a Linux problem, too.
Not meant as a proposal, just loud thinking... :-) But as said, the incomplete escaping is a complete mess. Ciao -- Chris On 07.01.18 19:54, Christian Tismer wrote: > By "normal user expectations" I meant the behavior when the builtin commands > were normal programs. > > Using "shell=True" is everywhere recommended to avoid, and I believe > we could avoid it by giving them replacements for build-ins. > > But I don't care if the shell escaping is correct. And that is not > trivial, either. > > On 07.01.18 18:22, Guido van Rossum wrote: >> On Sun, Jan 7, 2018 at 8:17 AM, Christian Tismer <tis...@stackless.com >> <mailto:tis...@stackless.com>> wrote: >> >> As a side note: In most cases where shell=True is found, people >> seem to need evaluation of the PATH variable. To my understanding, >> >> >>> from subprocess import call >> >>> call(("ls",)) >> >> works in Linux, but (with dir) not in Windows. But that is misleading >> because "dir" is a builtin command but "ls" is not. The same holds for >> "del" (Windows) and "rm" (Linux). >> >> So I thought that using shell=True was a good Thing on windows, >> but actually it is the start of all evil. >> Using regular commands like "git" works fine on Windows and Linux >> without the shell=True parameter. >> >> Perhaps it would be a good thing to emulate the builtin programs >> in python by some shell=True replacement (emulate_shell=True?) >> to match the normal user expectations without using the shell? >> >> >> That feels like a terrible idea to me. How do you define "normal user >> expectations" here? If people want shell builtins they should just use >> shell=True. (Also note IIUC there are several quite different shells >> commonly used on Windows, e.g. PowerShell.) >> >> -- >> --Guido van Rossum (python.org/~guido <http://python.org/~guido>) > > -- Christian Tismer-Sperling :^) tis...@stackless.com Software Consulting : http://www.stackless.com/ Karl-Liebknecht-Str. 121 : https://github.com/PySide 14482 Potsdam : GPG key -> 0xFB7BEE0E phone +49 173 24 18 776 fax +49 (30) 700143-0023
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