NP15 程序员节

思路：

step1：按照对应要求，for循环后对应格式化输出即可；

代码如下：

users_list = ['Niuniu','Niumei','Niu Ke Le']
for i in users_list:
    print('Hi, {}! Welcome to Nowcoder!'.format(i))
print('Happy Programmers\' Day to everyone!')