New submission from Mansour <mans...@oxplot.com>: I have a web server written in python which takes an optional argument telling it what IP and port to bind to. Here's the definition:
parser.add_argument( '-b', '--bind', metavar="[ip]:port", type=unicode, help="IP and port to bind to." ) There are several other arguments as well. When the usage is printed (due to parse failures or -h), if the command line is longer than terminal width, it is wrapped. Here is the (relevant) code in argparse.py:311 which deals with this scenario: # wrap the usage parts if it's too long text_width = self._width - self._current_indent if len(prefix) + len(usage) > text_width: # break usage into wrappable parts part_regexp = r'\(.*?\)+|\[.*?\]+|\S+' opt_usage = format(optionals, groups) pos_usage = format(positionals, groups) opt_parts = _re.findall(part_regexp, opt_usage) pos_parts = _re.findall(part_regexp, pos_usage) assert ' '.join(opt_parts) == opt_usage assert ' '.join(pos_parts) == pos_usage Note how part_regexp extracts words, and text surrounded with round/square brackets. Now the argument I defined above, when displayed in usage text, looks like this: [-b [ip]:port] part_regexp however, will cut it into "[-b [ip]" and ":port]" and concatenated later with " ", it will have an extra space which causes the first assertion to fail. I fiddled with part_regexp but that proved unreliable at best. I think the opt_parts should be obtained, not from the final formatted text, but from actual argument objects. For a demonstration, see the attachment. ---------- components: Library (Lib) files: argparse_wrap_test.py messages: 153632 nosy: oxplot priority: normal severity: normal status: open title: argparse: assertion failure if optional argument has square/round brackets in metavar type: crash versions: Python 2.7 Added file: http://bugs.python.org/file24554/argparse_wrap_test.py _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue14046> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
