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Thu Oct 8 17:27:14 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-October/092789.html

Benjamin Peterson wrote:
> 2009/10/8 Eric Smith <eric at trueblade.com>:
>> Christian Tanzer wrote:
>>> IMHO, either the translation is done once and gives identical output or
>>> it isn't worth doing at all.
>> I disagree. I doubt even 0.001% of all format strings involve octal
>> formatting. Is it really worth not providing a transition path if it can't
>> cover this case?
> 
> It's also really easy to just write 0{:o} like my translator does.
> 
> 

I apologize for not having looked at anyone's implementation yet. But I 
suspect you'll have a problem with this case unless int.__format__ has 
special logic for backward compatible octal formatting:

 >>> '%# 5o' % 8
'  010'

Eric.

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[Python-Dev] transitioning from % to {} formatting