* anatoly techtonik <techto...@gmail.com> [2014-06-12 02:00:55 +0300]: > On Thu, Jun 12, 2014 at 1:30 AM, Chris Angelico <ros...@gmail.com> wrote: > > > Why pass shell=True when executing a single > > command? I don't get it. > > > > I don't know about Linux, but on Windows programs are not directly > available as /usr/bin/python, so you need to find command in PATH > directories. Passing shell=True makes this lookup done by shell and not > manually.
As it's been said, the whole *point* of shell=True is to be able to use shell features, so ^ being escaped automatically just would be... broken. How would I escape > then, for example ;) You basically have two options: - Do the lookup in PATH yourself, it's not like that's rocket science. I haven't checked if there's a ready function for it in the stdlib, but even when not: Get os.environ['PATH'], split it by os.pathsep, then for every directory check if your binary is in there. There's also some environment variable on Windows which contains the possible extensions for a binary in PATH, add that, and that's all. - Use shell=True and a cross-platform shell escape function. I've wrote one for a project of mine: [1] I've written some tests[2] but I haven't checked all corner-cases, so I can't guarantee it'll always work, as the interpretation of special chars by cmd.exe *is* black magic, at least to me. Needless to say this is probably the worse choice of the two. [1] http://git.the-compiler.org/qutebrowser/tree/qutebrowser/utils/misc.py?id=dffec73db76c867d261ec3416de011becb209f13#n154 [2] http://git.the-compiler.org/qutebrowser/tree/qutebrowser/test/utils/test_misc.py?id=dffec73db76c867d261ec3416de011becb209f13#n195 Florian -- http://www.the-compiler.org | m...@the-compiler.org (Mail/XMPP) GPG 0xFD55A072 | http://the-compiler.org/pubkey.asc I love long mails! | http://email.is-not-s.ms/
pgpy7W5wzDW9z.pgp
Description: PGP signature
_______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
