[issue19700] Update runpy for PEP 451

[Brett Cannon]

Changes by Brett Cannon <brett at python.org>:


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components: Library (Lib)
nosy: brett.cannon, eric.snow, ncoghlan
priority: normal
severity: normal
stage: test needed
status: open
title: Update runpy for PEP 451
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19700>
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