Amaury Forgeot d'Arc added the comment:

This is one case of chained comparisons:
http://docs.python.org/3/reference/expressions.html#not-in

"x <= y <= z" is equivalent to "(x <= y) and (y <= z)"
"x in y == z" is equivalent to "(x in y) and (y == z)"

There is a jump if the 'in' expression is false, because 'and' should 
short-circuit the second comparison.

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nosy: +amaury.forgeotdarc
resolution:  -> invalid
status: open -> pending

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18208>
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