A list display yields a new list object. Its contents are specified
by providing either a list of expressions or a list comprehension.
When a comma-separated list of expressions is supplied, its elements are
evaluated from left to right and placed into the list object in that
order. When a list comprehension is supplied, it consists of a
single expression followed by at least one for clause and zero or
more for or if clauses. In this
case, the elements of the new list are those that would be produced
by considering each of the for or if clauses a block,
nesting from
left to right, and evaluating the expression to produce a list element
each time the innermost block is reached.