[issue18585] Add a text truncation function

[Antoine Pitrou]

Antoine Pitrou added the comment:

Perhaps the "placeholder" argument should actually include the last whitespace, to allow people to omit the whitespace, or use a non-breaking space instead?

   >>> textwrap.summarize("Hello  world!", width=11, placeholder='...')
   'Hello...'

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18585>
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