def find_sym(input_list):    res = []    for a in input_list:        to_list = list(a)        ll = len(to_list)        m, f = ll / 2, True        for b in range(m):            if to_list[b] == to_list[ll - b - 1]:                continue            else:                f = False                break        if f:            res.append(a)    return res

输入：find_sym(['001100', '11011', '123456754321', '12345654321','123456654321'])

输出：['001100', '11011', '12345654321', '123456654321']