Re: apt-get

>> try:
>>     import sys
>>     if sys.path and sys.path[0] == '/usr/lib':
>>         # Avoid ImportError noise due to odd installation location.
>>         sys.path.pop(0)
>>     if sys.version < '3':
>>         # We might end up being executed with Python 2 due to an old
>>         # /etc/bash.bashrc.
>>         import os
>>         if "COMMAND_NOT_FOUND_FORCE_PYTHON2" not in os.environ:
>>             os.execvp("python3", [sys.argv[0]] + sys.argv)

>>     import gettext
>>     import locale
>>     from optparse import OptionParser

>>     from CommandNotFound.util import crash_guard
>>     from CommandNotFound import CommandNotFound
>> except KeyboardInterrupt:
>>     import sys
>>     sys.exit(127)

>> def enable_i18n():
>>     cnf = gettext.translation("command-not-found", fallback=True)
>>     kwargs = {}
>>     if sys.version < '3':
>>         kwargs["unicode"] = True
>>     cnf.install(**kwargs)
>>     try:
>>         locale.setlocale(locale.LC_ALL, '')
>>     except locale.Error:
>>         locale.setlocale(locale.LC_ALL, 'C')

>> def fix_sys_argv(encoding=None):
>>     """
>>     Fix sys.argv to have only unicode strings, not binary strings.
>>     This is required by various places where such argument might be
>>     automatically coerced to unicode string for formatting
>>     """
>>     if encoding is None:
>>         encoding = locale.getpreferredencoding()
>>     sys.argv = [arg.decode(encoding) for arg in sys.argv]

>> class LocaleOptionParser(OptionParser):
>>     """
>>     OptionParser is broken as its implementation of _get_encoding() uses
>>     sys.getdefaultencoding() which is ascii, what it should be using is
>>     locale.getpreferredencoding() which returns value based on LC_CTYPE
>> (most
>>     likely) and allows for UTF-8 encoding to be used.
>>     """
>>     def _get_encoding(self, file):
>>         encoding = getattr(file, "encoding", None)
>>         if not encoding:
>>             encoding = locale.getpreferredencoding()
>>         return encoding

>> def main():
>>     enable_i18n()
>>     if sys.version < '3':
>>         fix_sys_argv()
>>     parser = LocaleOptionParser(
>>         version=__version__,
>>         usage=_("%prog [options] <command-name>"))
>>     parser.add_option('-d', '--data-dir', action='store',
>>                       default="/usr/share/command-not-found",
>>                       help=_("use this path to locate data fields"))
>>     parser.add_option('--ignore-installed', '--ignore-installed',
>>                       action='store_true',  default=False,
>>                       help=_("ignore local binaries and display the
>> available packages"))
>>     parser.add_option('--no-failure-msg',
>>                       action='store_true', default=False,
>>                       help=_("don't print '<command-name>: command not
>> found'"))
>>     (options, args) = parser.parse_args()
>>     if len(args) == 1:
>>         cnf = CommandNotFound(options.data_dir)
>>         if not cnf.advise(args[0], options.ignore_installed) and not
>> options.no_failure_msg:
>>             print(_("%s: command not found") % args[0], file=sys.stderr)

>> if __name__ == "__main__":
>>     crash_guard(main, BUG_REPORT_URL, __version__)