[Python-Dev] PEP 460 reboot

[Yury Selivanov]

On January 13, 2014 at 12:45:40 PM, R. David Murray (rdmurray at bitdance.com) wrote:
[snip]
> There is no use case in the sense you are asking, just like there  
> is no
> real use case for '%s' % b'x' producing "b'x'". But the real use  
> case
> is exactly the same: to let you know your code is screwed up without  
> actually blowing up with a encoding Exception.

Blowing up with an encoding exception is the *only* sane method of
making you aware that something is wrong. It’s much better than
just keeping producing some broken output, until it gets noticed.

What’s the point of writing a piece of software that is working wrong
without crashing?

> For the record, I like Guido's logic and proposal. I don't understand  
> Nick's objection, since I don't see the difference between the  
> situation
> here where a string gets interpolated into bytes as 'xxx' and  
> the
> corresponding situation where bytes gets interpolated into  
> a string
> as b'xxx'. Why struggle to keep bytes interpolation "pure" if  
> string
> interpolation isn’t?

Isn’t the whole point of this discussion to make python2 people
who want to migrate on python3 happier?  What’s the point for them
to have a ported python2 code that produces "Status: b’42’” for
"b’Status: %d’ % 42”? And if you want to call ‘str’ on 42 and then
encode the output in latin-1/ascii, then you’re just turning python3
in python2.

-
Yury