2.1.7 Blank lines
A logical line that contains only spaces, tabs, formfeeds and possibly a comment, is
ignored (i.e., no NEWLINE token is generated). During interactive input of statements,
handling of a blank line may differ depending on the implementation of the read-eval-print
loop. In the standard implementation, an entirely blank logical line (i.e. one containing
not even whitespace or a comment) terminates a multi-line statement.