Hi,
Le 16/07/2014 19:07, dw+python-...@hmmz.org a écrit :
Attached is a (rough) patch implementing this, feel free to try it with
hg tip.
Thanks for your work. Please post any patch to http://bugs.python.org
Regards
Antoine.
___
Python-Dev mai
On 16 Jul 2014 20:00, wrote:
> On Thu, Jul 17, 2014 at 03:44:23AM +0600, Mikhail Korobov wrote:
> > I believe this problem affects tornado (
https://github.com/tornadoweb/tornado/
> > Do you know if there a workaround? Maybe there is some stdlib part that
I'm
> > missing, or a module on PyPI? It i
It's worth note that a natural extension of this is to do something very
similar on the write side: instead of generating a temporary private
heap allocation, generate (and freely resize) a private PyBytes object
until it is exposed to the user, at which point, _getvalue() returns it,
and converts
On Thu, Jul 17, 2014 at 03:44:23AM +0600, Mikhail Korobov wrote:
> So making code 3.x compatible by ditching cStringIO can cause a serious
> performance/memory regressions. One can change the code to build the data
> using BytesIO (without creating bytes objects in the first place), but that is
>
Hi,
cStringIO was removed from Python 3. It seems the suggested replacement is
io.BytesIO. But there is a problem: cStringIO.StringIO(b'data') didn't copy
the data while io.BytesIO(b'data') makes a copy (even if the data is not
modified later).
This means io.BytesIO is not suited well to cases wh
On Wed, 16 Jul 2014 10:10:07 -0700, Devin Jeanpierre
wrote:
> On Wed, Jul 16, 2014 at 6:37 AM, R. David Murray
> wrote:
> > IMO, preventing someone from shooting themselves in the foot by modifying
> > something they shouldn't modify according to the API is not a Python
> > use case ("consentin
On Wed, Jul 16, 2014 at 6:37 AM, R. David Murray wrote:
> IMO, preventing someone from shooting themselves in the foot by modifying
> something they shouldn't modify according to the API is not a Python
> use case ("consenting adults").
Then why have immutable objects at all? Why do you have to p
Am 16.07.2014 13:40, schrieb Andreas Maier:
Am 13.07.2014 22:05, schrieb Akira Li:
Nick Coghlan writes:
...
There was related issue "Tuple comparisons with NaNs are broken"
http://bugs.python.org/issue21873
but it was closed as "not a bug" despite the corresponding behavior is
*not documented*
On Wed, Jul 16, 2014 at 09:47:59AM -0400, R. David Murray wrote:
> It would be nice to be able to return a frozendict instead of having the
> overhead of building a new dict on each call.
There already is an in-between available both to Python and C:
PyDictProxy_New() / types.MappingProxyType. It
Am 13.07.2014 18:23, schrieb Steven D'Aprano:
On Sun, Jul 13, 2014 at 05:13:20PM +0200, Andreas Maier wrote:
Second, if not by delegation to equality of its elements, how would the
equality of sequences defined otherwise?
Wow. I'm impressed by the amount of detailed effort you've put into
inv
Am 13.07.2014 22:05, schrieb Akira Li:
Nick Coghlan writes:
...
definition of floats and the definition of container invariants like
"assert x in [x]")
The current approach means that the lack of reflexivity of NaN's stays
confined to floats and similar types - it doesn't leak out and infect
t
On Wed, Jul 16, 2014 at 7:47 AM, R. David Murray wrote:
> After I hit send on my previous message, I thought more about your
> example. One of the issues here is that modifying the dict breaks an
> invariant of the API. I have a similar situation in the email module,
> and I used the same soluti
On Wed, 16 Jul 2014 14:04:29 -, dw+python-...@hmmz.org wrote:
> On Wed, Jul 16, 2014 at 09:47:59AM -0400, R. David Murray wrote:
>
> > It would be nice to be able to return a frozendict instead of having the
> > overhead of building a new dict on each call.
>
> There already is an in-between
On Wed, 16 Jul 2014 03:27:23 +0100, MRAB wrote:
> >>> # Try modifying the pattern object.
> ... p.groupindex['JUNK'] = 'foobar'
> >>>
> >>> # What are the named groups now?
> ... p.groupindex
> {'first': 1, 'second': 2, 'JUNK': 'foobar'}
> >>>
> >>> # And the match object?
> ... m.groupdict()
On Wed, 16 Jul 2014 03:27:23 +0100, MRAB wrote:
> Here's another use-case.
>
> Using the 're' module:
>
> >>> import re
> >>> # Make a regex.
> ... p = re.compile(r'(?P\w+)\s+(?P\w+)')
> >>>
> >>> # What are the named groups?
> ... p.groupindex
> {'first': 1, 'second': 2}
> >>>
> >>> # Per
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