#元组tuple()#定义tu=()#空元组tu1=(1,2,3)#一旦初始化，不可再改变#索引print(tu1[0])#1print(tu1[-1])#3#print(tu1[3])#报错超出索引范围#切片tu2=(1,2,3,4,5)print(tu2[0:2])#不允许改变'''tu2[0]=6#TypeError:'tu