[issue18242] IDLE should not be replacing warnings.formatwarning

[Brett Cannon]

New submission from Brett Cannon:

Both idlelib.run and idlelib.PyShell replace warning.formatwarning which is a no-no. Only warning.showwarning is design to be replaced in any way. The proper solution is to replace warnings.showwarning with code that calls whatever formatting function you provide.

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components: IDLE
messages: 191344
nosy: brett.cannon
priority: normal
severity: normal
stage: needs patch
status: open
title: IDLE should not be replacing warnings.formatwarning
type: behavior
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18242>
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