[docs] [issue14097] Improve the "introduction" page of the tutorial

[Raymond Hettinger]

Raymond Hettinger added the comment:

Please add the "x = y = z = 0" example back.  It doesn't improve the tutorial to dumb it down or to leave out basic knowledge.  You may not like the feature but it is a long standing part of the core language.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14097>
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