Eric V. Smith <e...@trueblade.com> added the comment:
Run 3.7 with -Wd: $ python3 -Wd Python 3.7.3 (default, Mar 29 2019, 13:03:53) [GCC 7.4.0] on cygwin Type "help", "copyright", "credits" or "license" for more information. >>> 'a \; b' <stdin>:1: DeprecationWarning: invalid escape sequence \; 'a \\; b' >>> The deprecation is in relation to invalid escape sequences, not shlex. My point is just that you should use r'a \; b' or 'a \\;b', and not rely on invalid escape sequences. For one reason, I can never remember how they're interpreted, and had to look it up. r-strings don't have anything to do with regular expressions per-se, they're a way of changing how python interprets stings, no matter what they're used for. > The point is that it's not possible to use the output of shlex.shlex to try > to match the behaviour of a POSIX-compliant shell by reliably splitting up a > user's input into multiple commands. In the first case I presented (no escape > character), the user entered two commands. In the second case, the user > entered a single command with two arguments. However, there's no way to > differentiate the two situations based on the output of shlex. My question is: can a posix-compliant shell tell the difference? I don't know, it's an honest question. Can you show some shell code where it can tell the difference? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue36897> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
