How to use the asteval.valid_symbol_name function in asteval

def __setitem__(self, key, par):
        """TODO: add magic method docstring."""
        if key not in self:
            if not valid_symbol_name(key):
                raise KeyError("'%s' is not a valid Parameters name" % key)
        if par is not None and not isinstance(par, Parameter):
            raise ValueError("'%s' is not a Parameter" % par)
        OrderedDict.__setitem__(self, key, par)
        par.name = key
        par._expr_eval = self._asteval
        self._asteval.symtable[key] = par.value