req_section : REQUIREMENTS ASSIGN_EQUAL LCURLY string_list RCURLY SEMI
                       | REQUIREMENTS LCURLY string_list RCURLY SEMI
                       | empty

def p_req_section(self, p):
        '''req_section : REQUIREMENTS ASSIGN_EQUAL LCURLY string_list RCURLY SEMI
                       | REQUIREMENTS LCURLY string_list RCURLY SEMI
                       | empty'''
        if len(p) == 7:
            p[0] = p[4]
        elif len(p) == 6:
            p[0] = p[3]
        self._print_verbose('requirements')