reader

Return a reader object that will process lines from the given iterable.

The "iterable" argument can be any object that returns a line
of input for each iteration, such as a file object or a list.  The
optional "dialect" argument defines a CSV dialect.  The function
also accepts optional keyword arguments which override settings
provided by the dialect.

The returned object is an iterator.  Each iteration returns a row
of the CSV file (which can span multiple input lines).