(p)
for_loop : FOR "(" parameter_list ")"
                | FOR "(" parameter_list ";" expression ";" parameter_list ")"
for_loop : FOR "(" parameter_list ")"
                | FOR "(" parameter_list ";" expression ";" parameter_list ")"
for_loop : FOR ( parameter_list ) | FOR ( parameter_list ; expression ; parameter_list )
def p_for_loop(p):
    '''for_loop : FOR "(" parameter_list ")"
                | FOR "(" parameter_list ";" expression ";" parameter_list ")"'''
def p_for_loop ( p ) :