22 giving a tuple type with ellipsis means that number of elements in this tuple is not known, but type is known: ... not using ellipsis means a tuple with specific number of elements, e.g.: ... This goes in contrast to notation of other collections, e.g. list[str] means list of any length with elements of type str.
1 A tuple is useful for storing multiple values.. As you note a tuple is just like a list that is immutable - e.g. once created you cannot add/remove/swap elements. One benefit of being immutable is that because the tuple is fixed size it allows the run-time to perform certain optimizations.
A tuple consists of a number of values separated by commas. like ... tuple are index based (and also immutable) in Python. Here in this case have only two index 0, 1 available but you are trying to access the 3rd index.
Using a tuple instead of a list is like having an implied assert statement that this data is constant, and that special thought (and a specific function) is required to override that.
python - List vs tuple, when to use each? - Stack Overflow
Named tuples are basically easy-to-create, lightweight object types. Named tuple instances can be referenced using object-like variable dereferencing or the standard tuple syntax. They can be used similarly to struct or other common record types, except that they are immutable. They were added in Python 2.6 and Python 3.0, although there is a recipe for implementation in Python 2.4. For ...
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