human
Complete this python program:
def command_to_snippet(keyword):
assistant
#Here is the Python code you requested.

    """converts a LaTeX command, like \dosomething{arg1}{arg2} into a ST snippet
    like \dosomething{$1:arg1}{$2:arg2}
    """
    def replace_braces(matchobj):
        replace_braces.index += 1
        if (matchobj.group(1) is not None):
            word = matchobj.group(1)
            return (u'{${%d:%s}}' % (replace_braces.index, word))
        else:
            word = matchobj.group(2)
            return (u'[${%d:%s}]' % (replace_braces.index, word))
    replace_braces.index = 0
    m = BEGIN_ENV_RX.match(keyword)
    if m:
        item = bool(m.group('item'))
        name = m.group('name')
        if (not name):
            (replace, n) = BRACES_MATCH_RX.subn(replace_braces, keyword)
            final = (replace + u'\n${0}\n\\end{{$1}}$0'.format((replace_braces.index + 1)))
            return (keyword, final)
        else:
            remainder = (m.group('remainder1') or m.group('remainder2') or '')
            (replace, n) = BRACES_MATCH_RX.subn(replace_braces, remainder)
            final = u'\\begin{{{0}}}{1}\n'.format(name, (replace or ''))
            if item:
                final += u'\\item    ${0}\n'.format((replace_braces.index + 1))
            else:
                final += u'${0}\n'.format((replace_braces.index + 1))
            final += u'\\end{{{0}}}$0'.format(name)
            if item:
                return (keyword[:(-5)], final)
            else:
                return (keyword, final)
    else:
        (replace, n) = BRACES_MATCH_RX.subn(replace_braces, keyword)
        if ((n == 0) and (ALPHAS_RX.search(keyword[1:].strip()) is not None)):
            return (keyword, keyword)
        else:
            return (keyword, replace)