2.1.6 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.
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