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[Python-Dev] RFC: PEP 460: Add bytes % args and bytes.format(args) to Python 3.5

Eric V. Smith eric at trueblade.com
Fri Jan 10 23:20:32 CET 2014 
On 1/10/2014 5:12 PM, Victor Stinner wrote:
> 2014/1/10 Juraj Sukop <juraj.sukop at gmail.com>:
>> In the case of PDF, the embedding of an image into PDF looks like:
>>
>>     10 0 obj
>>       << /Type /XObject
>>          /Width 100
>>          /Height 100
>>          /Alternates 15 0 R
>>          /Length 2167
>>       >>
>>     stream
>>     ...binary image data...
>>     endstream
>>     endobj
> 
> What not building "10 0 obj ... stream" and "endstream endobj" in
> Unicode and then encode to ASCII? Example:
> 
> data = b''.join((
>   ("%d %d obj ... stream" % (10, 0)).encode('ascii'),
>   binary_image_data,
>   ("endstream endobj").encode('ascii'),
> ))

Isn't the point of the PEP to make it easier to port 2.x code to 3.5? Is
there really existing code like this in 2.x?

I think what we're trying to do is to make code that looks like:
   b'%d %d obj ... stream' % (10, 0)
work in both 2.x and 3.5.

But correct me if I'm wrong. I'll admit to not following 100% of these
emails.

Eric.
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