#邀请3个人一起共进晚餐name = ['jacky','kevin','bob']for i in name:    print('Welcom %s join my dinner'% i )#bob不能参加a = 'bob'd_name = name.remove(a)print('%s is no going to jion my dinner' % a)#新增加一个人luccyname.append('luccy')for i in name:    print('Welcom %s join my dinner'% i)#有更好的地方，又有3个人要加入我们（3个人加到最前面、中间、最后）print('We have better place,3 friends will jion us')name.insert(0,'user1')name.insert((len(name)//2),'user2')name.append('user3')for i in name:    print('Welcom %s join my dinner'% i)#只能邀请2个人参加了，删除人员只留两个人，并通知他们print('We just have two firends can jion my dinner')num = len(name)for i in range(num):    name2 = name.pop()    print('Sorry %s' % name2)    if num - i == 3:        breakfor i in name:    print('Welcom %s join my dinner'% i)#删除所有人，清空人员名单for i in range (len(name)):    del name[0]print("%s list is empty" % name)