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[Python-Dev] Issue #16153: PyUnicode_FromFormatV() must fail if the format string is invalid

Barry Warsaw barry at python.org
Mon Oct 8 23:50:55 CEST 2012 
On Oct 08, 2012, at 11:23 PM, Victor Stinner wrote:

>2012/10/8 Barry Warsaw <barry at python.org>:
>>>Does anyone know if there is a good reason why PyUnicode_FromFormatV()
>>>does not fail on invalid format string, but copies the format string
>>>as-if into the result?
>>>
>>>I would like to change this to raise a ValueError instead.
>>>PyUnicode_FromFormatV() is used by PyErr_Format(), so PyErr_Format()
>>>may now fail with a ValueError if the format string is invalid.
>>
>> This behavior is inherited from PyUnicode_FromFormat() which documents the
>> current behavior, so you can't change this in backward incompatible way.
>
>Yes, the current behaviour is documented, but I consider it as a bug. Would
>it be possible to change the behaviour to fix a "bug"?

If it's documented to behave that way, why would you still consider it a bug?
The current behavior is clearly intentional, the function is working as
intended, and there may be code out there that depends on this documented
functionality, or at least, it won't be prepared to handle the new exception.

Cheers,
-Barry
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