[docs] [issue14306] try/except block is both efficient and expensive?

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 7a93f6ee2ebc by Georg Brandl in branch '2.7':
Closes #14306: clarify expensiveness of try-except and update code snippet
http://hg.python.org/cpython/rev/7a93f6ee2ebc

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