blabla

def def_variables(s):
    """
    blabla
    """

    frame = inspect.currentframe().f_back
    try:
        if isinstance(s,str):
            s = re.split('\s|,', s)
        res = []
        for t in s:
            # skip empty stringG
            if not t:
                continue
            if t.count("@") > 0:
                sym = IndexedSymbol(t,Variable)
                t = t.strip('@')
            else:
                sym = Variable(t)
            frame.f_globals[t] = sym
            res.append(sym)
        if frame.f_globals.get('variables_order'):
            # we should avoid to declare symbols twice !
            frame.f_globals['variables_order'].extend(res)
        else:
            frame.f_globals['variables_order'] = res
        return res
    finally:
        del frame