New submission from Sergei Lebedev superbo...@gmail.com:
Current `mmap` implementation raises a ValueError if a sum of offset and length
exceeds file size, as reported by `fstat`. While perfectly valid for most
use-cases, it doesn't work for special files, for example:
with open(/proc/sys
Sergei Lebedev superbo...@gmail.com added the comment:
Do you have an example of a /proc entry with st_size == 0 that can be mmapped
(mapping /proc/sys/debug/exception-trace fails with EACCESS)?
Yes, I've ran into the issue, while trying to mmap /proc/xen/xsd_kva, which is
an
interface
Sergei Lebedev superbo...@gmail.com added the comment:
Passing mmap(2) a 0 length doesn't make much sense anyway - for
example, Linux returns EINVAL.
Yup, but passing mmap(2) a zero-sized file and a non-zero length works just
fine.
Why do you want a mmap? Why not using a file?
Because Xen
New submission from Sergei Lebedev:
According to the current import system documentation
> When calling ``__import__()`` as part of an import statement, the import
> system first checks the module global namespace for a function by that name.
> If it is not found, then the standar
Sergei Lebedev added the comment:
Is it possible to backport this patch to 2.7?
--
nosy: +superbobry
___
Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/
New submission from Sergei Lebedev :
LoadLibrary in Python 2.7 through 3.7 accepts None as an argument. I wonder if
this has been allowed for a reason? If not, it should probably be changed to
raise a TypeError instead.
>>> ctypes.cdll.LoadLibrary(None)
Interestingly, on P
Sergei Lebedev added the comment:
I know this patch has already been rejected, but I wanted to give another
potential use-case for accessing GC status from C: JIT compilers.
Imagine a JIT compiler which uses alternative storage for instance attributes.
In order to maintain correctness
Change by Sergei Lebedev :
--
nosy: +dino.viehland
___
Python tracker
<https://bugs.python.org/issue39358>
___
___
Python-bugs-list mailing list
Unsubscribe:
New submission from Sergei Lebedev :
tl;dr Passing a Python function as a freefunc to _PyEval_RequestCodeExtraIndex
leads to double-free. In general, I think that freefunc should not be allowed
to call other Python functions.
---
test_code.CoExtra registers a new co_extra slot with a ctypes
New submission from Sergei Lebedev :
Reproducer:
[x for x in [] if lambda: x]
This parses fine in 3.8, but doesn't parse in 3.9 because the grammar expects a
disjunction after if in for_if_clause [*]. While this change has zero practical
significance, I think it might be useful to maintain
New submission from Sergei Lebedev :
Motivating example:
>>> @dataclass
... class A:
... x: InitVar[int] = 0
... y: int = 1
...
>>> a = A()
>>> a.x
0
>>> a.y
1
PEP-557 does not specify if fields annotated with InitVar[...] are available
Sergei Lebedev added the comment:
I understand that this is a side-effect of having a default value, but I was
hoping we could delattr InitVar's in @dataclass.
I'm not aware of this causing problems, but it does feel a bit unsatisfying
that InitVar's with defaults are kept in the class
Sergei Lebedev added the comment:
> I strongly prefer that there not be inner named tuples.
Hi Raymond, do you still strongly prefer (row, col) to remain unnamed? If so,
could you comment on what makes you prefer that apart from (row, col) being
more common than (col, row)?
Are there
Sergei Lebedev added the comment:
I think the example has a minor typo.
The crash is reproducible on 3.9 if the last line in bar.py is
typing.get_type_hints(B.__init__)
instead of
typing.get_type_hints(B)
--
___
Python tracker
<ht
Change by Sergei Lebedev :
--
nosy: +slebedev
___
Python tracker
<https://bugs.python.org/issue46167>
___
___
Python-bugs-list mailing list
Unsubscribe:
Sergei Lebedev added the comment:
Is it worth also addressing the case where a @dataclass/typing.TypeDict class
is defined within a function?
```
from __future__ import annotations
import
Sergei Lebedev added the comment:
Is it worth filing a separate issue for locals()?
In my experience local classes are less common than cross-module inheritance,
so I suspect that the chances of someone accidentally hitting lack of locals()
forwarding are quite low. However, given how
17 matches
Mail list logo
