[issue18585] Add a text truncation function

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0bd257cd3e88 by Serhiy Storchaka in branch 'default':
Add shorten to __all_ (issues #18585 and #18725).
http://hg.python.org/cpython/rev/0bd257cd3e88

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<http://bugs.python.org/issue18585>
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