Collection types
The computer executes according to instructions , Not human will .
The set type is consistent with the concept of set in mathematics , Which contains 0 Unnecessary combination of one or more data items . The elements in the set are not repeatable , Element types can only be fixed data types , For example, integers 、 Floating point numbers 、 character string 、 Tuples etc. , list 、 Dictionary and collection types themselves are variable data types , Cannot appear as an element of a collection .
