On 10/7/22, c.bu...@posteo.jp <c.bu...@posteo.jp> wrote: > > I need to improve my understanding about how subprocess.Popen() does > quote arguments. I have special case here. > > Simple example: > Popen(['ls', '-l']) results on a shell in "ls -l" without quotation.
The shell is only used if Popen is instantiated with `shell=True`. The above example does not use the shell. It runs the "ls" executable directly. On POSIX systems, fork() and exec() are called to create the child process. The argument list is passed to exec() and becomes the argv array of the application's main() entry point function. On Windows systems, CreateProcessW() is called to created the child process. It requires a command-line string instead of an argument array. The argument list gets joined into a command-line string via subprocess.list2cmdline(), which is based on the rules that are used by the Windows C runtime library when it parses a command line into the argv array of an application's [w]main() entry point. That said, a Windows application is free to parse its command line however it wants, so listcmdline() is little more than a best guess. On Windows, Popen() may have to be called directly with a command-line string in some cases. -- https://mail.python.org/mailman/listinfo/python-list
