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

[Eric Smith]

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.