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

Glenn Linderman v+python at g.nevcal.com
Sat Jan 11 11:59:26 CET 2014

On 1/11/2014 1:44 AM, Stephen Hansen wrote:
> There's been a number of examples given: PDF, HTTP, network streams 
> that switch inline from text-ish to binary and back-again.. But, we 
> can focus that down to a very narrow and not at all uncommon situation 
> in the latter.

PDF has been mentioned a few times.  ReportLAB recently decided to 
convert to Python 3, and fairly quickly (from my perspective, it took 
them a _long_ time to decide to port, but once they decided to, then it 
seemed quick) produced an alpha version that passes many of their tests. 
I've not tried it yet, although it interests me, as I have some Python 2 
code written only because ReportLAB didn't support Python 3, and I 
wanted to generate some PDF files. I'll be glad to get rid of the Python 
2 code, once they are released.

But I guess they figured out a solution that wasn't onerous, I'd have to 
go re-read the threads to be sure, but it seems they are running one 
code base for both... not sure of the details of what techniques they 
used, or if they ever used the % operator :)

But I'm wondering, since they did what they did so quickly, if the 
"mixed bytes and str" use case is mostly, in fact, a mind-set issue... 
yes, likely some code has to change, but maybe the changes really aren't 
all that significant.

I wouldn't want to drag them into this discussion, I'd rather they get 
the port complete, but it would be interesting to know what they did, 
and how they did it, and what problems they had, etc. If anyone here 
knows that code a bit, perhaps the diffs could be examined in their 
repository to figure out what they did, and how much it impacted their 
code. I do know they switched XML parsers along the way, as well as 
dealing with string handling differences.
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