A Python sequence object, such as a list, is iterable. However, it has some additional features. We'll think of it as a materialized iterable. We've used the tuple() function in several examples to collect the output of a generator expression or generator function into a single tuple object. We can also materialize a sequence to create a list object.
In Python, a list display, or list comprehension, offers simple syntax to materialize a generator: we just add the [] brackets. This is ubiquitous to the point where the distinction between generator expression and list comprehension is lost. We need to disentangle the idea of generator expression from a list display that uses a generator expression.
The following ...
