New submission from STINNER Victor:

If the format string is invalid, PyUnicode_FromFormatV() formats the valid 
arguments and then copies the raw format string. Errors are silently ignored.

I propose to raise a ValueError if the format string is invalid. This change 
may "break" existing applications, but I hope that nobody relies on this "bug" 
:-)

Attached patch implements my proposition.

----------
files: invalid_format.patch
keywords: patch
messages: 172250
nosy: haypo
priority: normal
severity: normal
status: open
title: PyUnicode_FromFormatV() must fail if the format string is invalid
versions: Python 3.4
Added file: http://bugs.python.org/file27461/invalid_format.patch

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<http://bugs.python.org/issue16153>
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