#The ancestor
names=('alex','jack','eric') The ancestor is similar to the list, but it cannot be modified once it is created, so it is also called a read-only list. It has only two methods, one is count, the other is index
names=('alex','jack','eric') The ancestor is similar to the list, but it cannot be modified once it is created, so it is also called a read-only list. It has only two methods, one is count, the other is index