Tuples can be used as immutable lists from "summary" of Fluent Python by Luciano Ramalho
Tuples can be used as immutable lists. Although a tuple is not as flexible as a list, it is faster, and its immutable nature can provide some advantages. A tuple is an immutable, fixed-size, and heterogeneous sequence, just like a list. One common tuple use is as a record with no field names. Since tuples are immutable, their elements are like records fields. For example, a query function can return a tuple with the query string and a tuple of parameters. Tuples support all the list methods that do not involve adding or removing items, such as slicing and indexing. The + operator can be used to concatenate tuples to form a new tuple. If a tuple holds references to objects, those references will not change, but the objects themselves can be modified if they are mutable. However, if the referenced item...
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