guest_list=['Niuniu','Niu Ke Le']
for i in guest_list:
    print('{}, do you want to come to my celebration party?'.format(i))

print()
    
guest_list.insert(0,'GURR')#guest_list=['GURR','Niuniu','Niu Ke Le']
guest_list.insert(2,'Niumei')#guest_list=['GURR','Niuniu','Niumei','Niu Ke Le']
guest_list.append('LOLO')#guest_list=['GURR','Niuniu','Niumei','Niu Ke Le','LOLO']

for j in guest_list:
    print('{}, thank you for coming to my celebration party!'.format(j))

python列表list=['']的insert(index,obj)和append()方法,insert插入index索引位置,append添加到列表末尾。