R. David Murray added the comment:
Also you will note that the return of the empty list for an empty line is
exactly what you want for wrapping multiple line-break-delimited paragraphs.
Consider:
>>> doc = "a para\nanother para\n\na third, but with an extra blank line
between\n"
>>> for line in doc.splitlines():
... print('\n'.join(textwrap.wrap(line, width=5)))
... if line:
... print()
a
para
anoth
er
para
a thi
rd,
but
with
an
extra
blank
line
betwe
en
In other words, we need to add a blank line after our formatted paragraph,
unless it is empty, in which case we don't want to add one or we'll have an
extra. This assumes that single-line-paragraphs do not have blank lines
between them...if they do, then the algorithm is even simpler, as you don't
need the if.
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<http://bugs.python.org/issue15510>
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