survey_list=['Niumei', 'Niu Ke Le', 'GURR', 'LOLO']
result_dict={'Niumei': 'Nowcoder','GURR': 'HUAWEI'}
for i in survey_list:
    if i in result_dict:
        print('Hi, %s! Thank you for participating in our graduation survey!'%i)
    else:
        print('Hi, %s! Could you take part in our graduation survey?'%i)
总结：
1.列表和字典成员的检验都用in。
2.字符串的格式化，常用3种方法。可以以本题为例自行选择，输出结果一样。
1)'~~%s~~~~'%i
2)f'~{i}~~'
3)'~{}~~'.format(i)