# 不区分大小写验证会员名是否唯一
member = '|ZhangSan|LiSi|WangWu|ZhaoLiu|'
member1 = member.lower()
regName = input('输入注册的会员名：')
regName1 = '|' + regName.lower() + '|'
if regName1 in member1:
    print('会员名', regName, '已经存在')
else:
    print('会员名', regName, '可以注册')  
