19.09.20 00:44, Ethan Furman пише:
> I'm looking for arguments relating to:
>
> - should _convert_ make the default __repr__ be module_name.member_name?
In most cases enums with _convert_ are used to replace old module
globals. They are accessible as module_name.member_name and always used
as mod
On Mon, 21 Sep 2020 20:56:18 -0700
Ethan Furman wrote:
> And even more data:
>
> I added a body to the PR I was originally having trouble with:
>button stayed gray
>
> I went away for a while, say 5 - 10 minutes, and when I went back to
> that screen the button was green. I created the PR.
Why does `object` define rich comparison dunders `__lt__` etc?
As far as I can tell, `object.__lt__` etc always return NotImplemented.
Merely inheriting from object isn't enough to have comparisons work. So
why do they exist at all? Other "do nothing" dunders such as `__add__`
aren't defined.
Le lun. 21 sept. 2020 à 21:46, Antoine Pitrou a écrit :
> > The main benefit is the memory usage. For example, list(range(200))
> > uses 1656 bytes instead of 7262 (4x less memory).
>
> Hmm, how come? Aren't those tiny integers singletons already?
These numbers come from the code:
import sys
NotImplemented is like a pure virtual function; failing to implement it
tells you that you forgot part of the contract, except at runtime instead
of compile time. So if you never need them, you're free to elide them, but
if you want full compatibility, you need to implement every part of it.
If so
22.09.20 12:48, Steven D'Aprano пише:
> Why does `object` define rich comparison dunders `__lt__` etc?
>
> As far as I can tell, `object.__lt__` etc always return NotImplemented.
> Merely inheriting from object isn't enough to have comparisons work. So
> why do they exist at all? Other "do nothi
On Tue, Sep 22, 2020 at 02:13:46PM +0300, Serhiy Storchaka wrote:
> 22.09.20 12:48, Steven D'Aprano пише:
> > Why does `object` define rich comparison dunders `__lt__` etc?
> Because object.__eq__ and object.__ne__ exist. If you define slot
> tp_richcompare in C, it is exposed as 6 methods __eq__,
On Tue., 22 Sep. 2020, 10:25 pm Steven D'Aprano,
wrote:
> On Tue, Sep 22, 2020 at 02:13:46PM +0300, Serhiy Storchaka wrote:
> > 22.09.20 12:48, Steven D'Aprano пише:
> > > Why does `object` define rich comparison dunders `__lt__` etc?
>
> > Because object.__eq__ and object.__ne__ exist. If you de
On 9/22/20 12:11 AM, Serhiy Storchaka wrote:
The only exception is StrEnum -- overriding __str__ of str
subclass may be not safe. Some code will call str() implicitly, other
will read the string content of the object directly, and they will be
different.
Following up on that:
>>> import e
Hi Victor,
There are plenty of reasons for a new, cleaner C-API.
However, performance isn't really one of them.
The C-API is not much of an obstacle to improving the performance of
CPython, at the moment.
There are implementation details that leak into the API, but they are
only an issue when w
22.09.20 16:57, Ethan Furman пише:
> On 9/22/20 12:11 AM, Serhiy Storchaka wrote:
>> The only exception is StrEnum -- overriding __str__ of str
>> subclass may be not safe. Some code will call str() implicitly, other
>> will read the string content of the object directly, and they will be
>> differ
On 22/09/20 10:06 pm, Victor Stinner wrote:
I wrote a simple implementation which leaves the code as it
is, but "unbox" tagged pointers when a function access directly object
members. Example in listobject.c:
vl = (PyLongObject*)_Py_TAGPTR_UNBOX(v);
wl = (PyLongObject*)_Py_TAGPTR_UNBOX
On 23/09/20 12:20 am, Steven D'Aprano wrote:
Presumably back when rich comparisons were added, the choice would have
been:
- add one tp_richcompare slot to support all six methods; or
- add six slots, one for each individual dunder
in which case the first option wastes much less space.
I don
On Tue, Sep 22, 2020 at 4:58 PM Greg Ewing
wrote:
> What are you trying to achieve by using tagged pointers?
>
> It seems to me that in a dynamic environment like Python, tagged
> pointer tricks are only ever going to reduce memory usage, not
> make anything faster, and in fact can only make thin
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