[docs] [issue18840] Tutorial recommends pickle module without any warning of insecurity

[Roundup Robot]

Roundup Robot added the comment:

New changeset 481b30bfe496 by Antoine Pitrou in branch '2.7':
Issue #18840: Introduce the json module in the tutorial, and deemphasize the pickle module.
http://hg.python.org/cpython/rev/481b30bfe496

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18840>
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