I suppose you should write to python-...@python.org , or in
https://discuss.python.org/ under the section Core development
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On Mon, 2 May 2022 at 18:31, Stefan Ram wrote:
>
> |The Unicode standard defines a number of characters that
> |conforming applications should recognize as line terminators:[7]
> |
> |LF:Line Feed, U+000A
> |VT:Vertical Tab, U+000B
> |FF:Form Feed, U+000C
> |CR:Carriage Return, U+0
Ok, I suppose \n and \r are enough:
readline(size=- 1, /)
Read and return one line from the stream. If size is specified, at
most size bytes will be read.
The line terminator is always b'\n' for binary files; for text files,
the newline argument to open() can be used to select the line
On Mon, 2 May 2022 at 00:20, Cameron Simpson wrote:
>
> On 01May2022 18:55, Marco Sulla wrote:
> >Something like this is OK?
> [...]
> >def tail(f):
> >chunk_size = 100
> >size = os.stat(f.fileno()).st_size
>
> I think you want
I have a little problem.
I tried to extend the tail function, so it can read lines from the bottom
of a file object opened in text mode.
The problem is it does not work. It gets a starting position that is lower
than the expected by 3 characters. So the first line is read only for 2
chars, and th
On Sat, 7 May 2022 at 01:03, Dennis Lee Bieber wrote:
>
> Windows also uses for the EOL marker, but Python's I/O system
> condenses that to just internally (for TEXT mode) -- so using the
> length of a string so read to compute a file position may be off-by-one for
> each EOL in the stri
On Sat, 7 May 2022 at 16:08, Barry wrote:
> You need to handle the file in bin mode and do the handling of line endings
> and encodings yourself. It’s not that hard for the cases you wanted.
>>> "\n".encode("utf-16")
b'\xff\xfe\n\x00'
>>> "".encode("utf-16")
b'\xff\xfe'
>>> "a\nb".encode("utf-16
On Sat, 7 May 2022 at 19:02, MRAB wrote:
>
> On 2022-05-07 17:28, Marco Sulla wrote:
> > On Sat, 7 May 2022 at 16:08, Barry wrote:
> >> You need to handle the file in bin mode and do the handling of line
> >> endings and encodings yourself. It’s not that hard
I think I've _almost_ found a simpler, general way:
import os
_lf = "\n"
_cr = "\r"
def tail(filepath, n=10, newline=None, encoding=None, chunk_size=100):
n_chunk_size = n * chunk_size
pos = os.stat(filepath).st_size
chunk_line_pos = -1
lines_not_found = n
with open(filepath
On Sun, 8 May 2022 at 20:31, Barry Scott wrote:
>
> > On 8 May 2022, at 17:05, Marco Sulla wrote:
> >
> > def tail(filepath, n=10, newline=None, encoding=None, chunk_size=100):
> >n_chunk_size = n * chunk_size
>
> Why use tiny chunks? You can read 4KiB as f
On Sun, 8 May 2022 at 22:02, Chris Angelico wrote:
>
> Absolutely not. As has been stated multiple times in this thread, a
> fully general approach is extremely complicated, horrifically
> unreliable, and hopelessly inefficient.
Well, my implementation is quite general now. It's not complicated a
On Sun, 8 May 2022 at 22:34, Barry wrote:
>
> > On 8 May 2022, at 20:48, Marco Sulla wrote:
> >
> > On Sun, 8 May 2022 at 20:31, Barry Scott wrote:
> >>
> >>>> On 8 May 2022, at 17:05, Marco Sulla
> >>>> wrote:
> >>>
&g
On Mon, 9 May 2022 at 07:56, Cameron Simpson wrote:
>
> The point here is that text is a very different thing. Because you
> cannot seek to an absolute number of characters in an encoding with
> variable sized characters. _If_ you did a seek to an arbitrary number
> you can end up in the middle of
On Mon, 9 May 2022 at 19:53, Chris Angelico wrote:
>
> On Tue, 10 May 2022 at 03:47, Marco Sulla
> wrote:
> >
> > On Mon, 9 May 2022 at 07:56, Cameron Simpson wrote:
> > >
> > > The point here is that text is a very different thing. Because you
>
On Mon, 9 May 2022 at 23:15, Dennis Lee Bieber
wrote:
>
> On Mon, 9 May 2022 21:11:23 +0200, Marco Sulla
> declaimed the following:
>
> >Nevertheless, tail is a fundamental tool in *nix. It's fast and
> >reliable. Also the tail command can't handle different
On Wed, 11 May 2022 at 22:09, Chris Angelico wrote:
>
> Have you actually checked those three, or do you merely suppose them to be
> true?
I only suppose, as I said. I should do some benchmark and some other
tests, and, frankly, I don't want to. I don't want to because I'm
quite sure the impleme
On Thu, 12 May 2022 at 00:50, Stefan Ram wrote:
>
> Marco Sulla writes:
> >def tail(filepath, n=10, chunk_size=100):
> >if (n <= 0):
> >raise ValueError(_err_n)
> ...
>
> There's no spec/doc, so one can't even test it.
Excuse me, you&#
Thank you very much. This helped me to improve the function:
import os
_lf = b"\n"
_err_n = "Parameter n must be a positive integer number"
_err_chunk_size = "Parameter chunk_size must be a positive integer number"
def tail(filepath, n=10, chunk_size=100):
if (n <= 0):
raise ValueErr
On Fri, 13 May 2022 at 00:31, Cameron Simpson wrote:
> On 12May2022 19:48, Marco Sulla wrote:
> >On Thu, 12 May 2022 at 00:50, Stefan Ram wrote:
> >> There's no spec/doc, so one can't even test it.
> >
> >Excuse me, you're very right.
> >
On Fri, 13 May 2022 at 12:49, <2qdxy4rzwzuui...@potatochowder.com> wrote:
>
> On 2022-05-13 at 12:16:57 +0200,
> Marco Sulla wrote:
>
> > On Fri, 13 May 2022 at 00:31, Cameron Simpson wrote:
>
> [...]
>
> > > This is nearly the worst "specificat
Well, I've done a benchmark.
>>> timeit.timeit("tail('/home/marco/small.txt')", globals={"tail":tail},
>>> number=10)
1.5963431186974049
>>> timeit.timeit("tail('/home/marco/lorem.txt')", globals={"t
On Wed, 18 May 2022 at 23:32, Cameron Simpson wrote:
>
> On 17May2022 22:45, Marco Sulla wrote:
> >Well, I've done a benchmark.
> >>>> timeit.timeit("tail('/home/marco/small.txt')", globals={"tail":tail},
> >>>>
The package arrow has a simple shift method for months, weeks etc
https://arrow.readthedocs.io/en/latest/#replace-shift
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I tried to check for memory leaks in a bunch of functions of mine using a
simple decorator. It works, but it fails with this code, returning a random
count_diff at every run. Why?
import tracemalloc
import gc
import functools
from uuid import uuid4
import pickle
def getUuid():
return str(uuid
On Thu, 21 Jul 2022 at 22:28, MRAB wrote:
>
> It's something to do with pickling iterators because it still occurs
> when I reduce func_76 to:
>
> @trace
> def func_76():
> pickle.dumps(iter([]))
It's too strange. I found a bunch of true memory leaks with this
decorator. It seems to be relia
This naif code shows no leak:
import resource
import pickle
c = 0
while True:
pickle.dumps(iter([]))
if (c % 1) == 0:
max_rss = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
print(f"iteration: {c}, max rss: {max_rss} kb")
c += 1
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llect()
snapshot2 = tracemalloc.take_snapshot().filter_traces(
(tracemalloc.Filter(True, __file__), )
)
top_stats = snapshot2.compare_to(snapshot1, 'lineno')
tracemalloc.stop()
for stat in top_stats:
print(stat)
The result is:
/home/marco/sources/test.py:14: size=3339 B (+3339 B)
On Fri, 22 Jul 2022 at 09:00, Barry wrote:
> With code as complex as python’s there will be memory allocations that
occur that will not be directly related to the python code you test.
>
> To put it another way there is noise in your memory allocation signal.
>
> Usually the signal of a memory lea
I tried to follow the instructions here:
https://mypy.readthedocs.io/en/stable/stubgen.html
but the instructions about creating a stub for a C Extension are a little
mysterious. I tried to use it on the .so file without luck.
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On Fri, 29 Jul 2022 at 23:23, Barry wrote:
>
>
>
> > On 29 Jul 2022, at 19:33, Marco Sulla wrote:
> >
> > I tried to follow the instructions here:
> >
> > https://mypy.readthedocs.io/en/stable/stubgen.html
> >
> > but the instructions a
I was banned from the mailing list and Discuss forum for a very long time.
Too much IMHO, but I paid my dues.
Now this is my state in the forum:
- I never posted something unrespectful in the last months
- I have a limitation of three posts per threads, but only on some threads
- Some random posts
On Wed, 24 Feb 2021 at 06:29, Random832 wrote:
> I was surprised, though, to find that you can't remove items directly from
> the key set, or in general update it in place with &= or -= (these operators
> work, but give a new set object).
This is because they are a view. Changing the key object
On Wed, 24 Feb 2021 at 15:02, Random832 wrote:
> On Wed, Feb 24, 2021, at 02:59, Marco Sulla wrote:
> > On Wed, 24 Feb 2021 at 06:29, Random832 wrote:
> > > I was surprised, though, to find that you can't remove items directly
> > > from the key set, or in gener
I use Sublime free for simple tasks. I like the fact it's fast and it
saves to disk immediately. You don't have even to name the file. I use
it also for taking notes. Probably not as powerful as Vim and it's
proprietary.
For development, I use PyCharm, but it's an IDE.
I also used in past:
gedit:
gt; list. What I was getting was a very time consuming (10 seconds or more)
> construction of an empty list.
I can't reproduce, Am I missing something?
marco@buzz:~$ python3
Python 3.6.9 (default, Jan 26 2021, 15:33:00)
[GCC 8.4.0] on linux
Type "help", "copyright", "cred
I have a curiosity. Python, as many languages, has assert as a
keyword. Can't it be implemented as a function? Is there an advantage
to have it as a keyword?
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On Mon, 1 Mar 2021 at 19:51, Alan Gauld via Python-list
wrote:
> Sorry, a bit OT but I'm curious. I haven't seen
> this before:
>
> yield from ()
>
> What is it doing?
> What do the () represent in this context?
It's the empty tuple.
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As title. Currently I ended up using this trick in my setup.py:
if len(argv) > 1 and argv[1] == "c":
sys.argv = [sys.argv[0]] + sys.argv[2:]
setuptools.setup(ext_modules = ext_modules, **common_setup_args)
else:
setuptools.setup(**common_setup_args)
So if I pass "c" as the first arg
On Wed, 10 Mar 2021 at 16:45, Thomas Jollans wrote:
> Why are you doing this?
>
> If all you want is for it to be possible to install the package from
> source on a system that can't use the C part, you could just declare
> your extension modules optional
Because I want to provide (at least) two
On Thu, 11 Mar 2021 at 23:11, Ethan Furman wrote:
> Basically, you are looking at two different philosophies:
>
> - Always double check, get good error message when something fails
>
> vs
>
> - check during testing and QA, turn off double-checks for production for best
> performance possible.
In
Have you tried to identify where in your code the surprising memory allocations
are made?
You could "bisect search" by adding breakpoints:
https://docs.python.org/3/library/functions.html#breakpoint
At which point does the problem start manifesting itself?
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> > For completeness, from 3.5 onwards, you can also do the following:
> > [{'name': n, **d} for n, d in dod.items()]
> Reading through these, personally I like this one best. I'm curious what
> about it was enabled in 3.5? Was **kwarg expansion inside a dict literal not
> possible before then? Any
> > At which point does the problem start manifesting itself?
> The problem spot is my cache(dict). I simplified my code to just load
> all the objects to this dict and then clear it.
What's the memory utilisation just _before_ performing this load? I am assuming
it's much less than this 1 GB you
> >> What if you increase the machine's (operating system's) swap space? Does
> >> that take care of the problem in practice?
> >
> > I can`t do that because it will affect other containers running on this
> > host.
> > In my opinion it may significantly reduce their performance.
>
> Assuming thi
> > Are you running with systemd?
>
> I really don't know.
An example of how to check:
```
$ readlink /sbin/init
/lib/systemd/systemd
```
You want to check which program runs as PID 1.
```
ps 1
```
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On 2021-04-01, Mahira Pamnani wrote:
> Sir
> I have been trying hard to install Python on my PC since a long time. The
> application gets installed but, for reasons unknown, it doesn't start.
> It keeps asking to repair, modify or uninstall the application.
> I have tried doing that too, but it sti
On 2021-04-01, ᗷᑌᑎᑎY wrote:
> When I enter the command pip install speech_recognition it say’s we cannot
> find a compatible version.
Try:
```
pip install SpeechRecognition
```
What's the output?
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> (a) basic linear presentation:
>
> resource = "Oil"
> time = 1
> crude = 2
> residue = 3
> my_list = "long"
>
> (b) using explicit tuples:
>
> ( resource, time, crude, residue, my_list ) = ( "Oil", 1, 2, 3, "long" )
>
> (c) linear and indented tuples:
>
> (
> resource,
> time,
>
> It seems that the os.open API cannot distinguish between a permission error
> and the fact that a directory cannot be opened like files.
> The following script reproduces the scenario (tested on Python 3.8.2
> (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (Intel)] on
> win32) :
I created a custom dict in a C extension. Name it `promethea`. How can
I implement `promethea[str, str]`? Now I get:
TypeError: 'type' object is not subscriptable
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Ooook. I have a question. Why is this code not present in
dictobject.c? Where are the dict annotations implemented?
On Sat, 18 Sept 2021 at 03:00, MRAB wrote:
>
> On 2021-09-17 21:03, Marco Sulla wrote:
> > I created a custom dict in a C extension. Name it `promethea`. H
I have two types declared as
PyTypeObject PyX_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
etc.
How can I mark one of the types as subclass of the other one? I tried
to use tp_base but it didn't work.
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I already added the address of the type to tp_base, but it does not work.
On Mon, 1 Nov 2021 at 17:18, Dieter Maurer wrote:
>
> Marco Sulla wrote at 2021-10-31 23:59 +0100:
> >I have two types declared as
> >
> >PyTypeObject PyX_Type = {
> >PyVarObject_HEAD_IN
*ahem* evidently I didn't check the right package. it works like a charme :D
On Tue, 2 Nov 2021 at 13:43, Marco Sulla wrote:
>
> I already added the address of the type to tp_base, but it does not work.
>
> On Mon, 1 Nov 2021 at 17:18, Dieter Maurer wrote:
> >
> &
As you can read here:
https://github.com/Marco-Sulla/python-frozendict/issues/37
Py_IS_TYPE(op, &PyDict_Type) did not work on MacOS. I had to use PyDict_Check.
Why don't I have this problem with Linux?
PS: since I'm creating a modified version of dict, I copied the dict
interna
Indeed now I use PyDict_Check, but anyway it's very strange that
Py_IS_TYPE(op, &PyDict_Type) does not work only on MacOS.
On Mon, 8 Nov 2021 at 19:30, Barry wrote:
>
>
>
> On 8 Nov 2021, at 07:45, Marco Sulla wrote:
>
> As you can read here:
>
> http
"]
undef_macros = []
setuptools.Extension(
ext1_fullname,
sources = cpython_sources,
include_dirs = cpython_include_dirs,
extra_compile_args = extra_compile_args,
undef_macros = undef_macros,
)
Here is the full code:
https://github.com/Marco-Sulla/python-frozendict/blob/ma
On Fri, 12 Nov 2021 at 15:55, Gisle Vanem wrote:
> Marco Sulla wrote:
> > Error LNK2001: unresolved external symbol PyErr_SetObject
> >
> > and so on.
> >
> > I post the part of my setup.py about the C Extension:
> >
> > extra_compile_args = ["-DP
:
https://github.com/Marco-Sulla/python-frozendict.git
On Linux and MacOS it works like a charme. On Windows, it seems it does not find
python3.lib. I also added its path to the PATH variable
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On Fri, 12 Nov 2021 at 21:09, Chris Angelico wrote:
>
> On Sat, Nov 13, 2021 at 7:01 AM Marco Sulla
> wrote:
> > On Fri, 12 Nov 2021 at 17:38, Chris Angelico wrote:
> > > Are you sure that you really need Py_BUILD_CORE?
> >
> > Yes, because I need the intern
. Sorry, the problem is I downloaded the 32 bit version of VS
compiler and 64 bit version of Python..
On Sat, 13 Nov 2021 at 11:10, Barry Scott wrote:
>
>
>
> > On 13 Nov 2021, at 09:00, Barry wrote:
> >
> >
> >
> >> On 12 Nov 2021, at 22:53, M
libraries expose the internal functions?
Anyway, is there a way to compile Python on Windows in such a way that
I get a shared library that exposes all the functions?
On Sat, 13 Nov 2021 at 12:17, Marco Sulla wrote:
>
> . Sorry, the problem is I downloaded the 32 bit version of VS
>
On Sun, 14 Nov 2021 at 16:42, Barry Scott wrote:
>
> Sorry iPad sent the message before it was complete...
>
> > On 14 Nov 2021, at 10:38, Marco Sulla wrote:
> >
> > Okay, now the problem seems to be another: I get the same "unresolved
> > external link&qu
It works. Thanks a lot.
On Sun, 19 Sept 2021 at 19:23, Serhiy Storchaka wrote:
>
> 19.09.21 05:59, MRAB пише:
> > On 2021-09-18 16:09, Serhiy Storchaka wrote:
> >> "(PyCFunction)" is redundant, Py_GenericAlias already has the right
> >> type. Overuse of casting to PyCFunction can hide actual bugs
I have a battery of tests done with pytest. My tests break with a
segfault if I run them normally. If I run them using pytest -v, the
segfault does not happen.
What could cause this quantical phenomenon?
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Have you tried the logger module and the format options?
On Fri, 19 Nov 2021 at 19:09, Ulli Horlacher
wrote:
>
> I am trying to get the source code line of the last error.
> I know traceback.format_exc() but this contains much more information, e.g.:
>
> Traceback (most recent call last):
> Fil
(venv_3_10) marco@buzz:~$ python
Python 3.10.0 (heads/3.10-dirty:f6e8b80d20, Nov 18 2021, 19:16:18)
[GCC 10.1.1 20200718] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = frozenset((3, 4))
>>>
Mh. Now I'm thinking that I've done
a = "Marco "
a += "Sulla"
many times without bothering.
On Fri, 19 Nov 2021 at 22:22, Chris Angelico wrote:
>
> On Sat, Nov 20, 2021 at 8:16 AM Chris Angelico wrote:
> >
> > On Sat, Nov 20, 2021 at 8:13 A
On Fri, 19 Nov 2021 at 20:38, MRAB wrote:
>
> On 2021-11-19 17:48, Marco Sulla wrote:
> > I have a battery of tests done with pytest. My tests break with a
> > segfault if I run them normally. If I run them using pytest -v, the
> > segfault does not happen.
> >
>
imple loop for all the cases, and
remove the optional parameter from bench. How boring.
PS: is there a way to monitor the Python consumed memory inside Python
itself? In this way I could also trap memory leaks.
On Sat, 20 Nov 2021 at 01:46, MRAB wrote:
>
> On 2021-11-19 23:44, Marco Sulla wr
I checked the documentation:
https://docs.python.org/3/c-api/typeobj.html#number-structs
and it seems that, in the Python C API, the right operators do not exist.
For example, there is nb_add, that in Python is __add__, but there's
no nb_right_add, that in Python is __radd__
Am I missing something
e:
>
> On 2021-11-20 17:40, Marco Sulla wrote:
> > Indeed I have introduced a command line parameter in my bench.py
> > script that simply specifies the number of times the benchmarks are
> > performed. This way I have a sort of segfault checker.
> >
> > But I
Yes, and you do this regularly. Indeed integers, for example, are immutables and
a = 0
a += 1
is something you do dozens of times, and you simply don't think that
another object is created and substituted for the variable named `a`.
On Mon, 22 Nov 2021 at 14:59, Chris Angelico wrote:
>
> On Tue
bject. The same for += and *= that are listed under `list`
only.
On Mon, 22 Nov 2021 at 19:54, Marco Sulla wrote:
>
> Yes, and you do this regularly. Indeed integers, for example, are immutables
> and
>
> a = 0
> a += 1
>
> is something you do dozens of times, and you simp
Ok, I created the script:
https://github.com/Marco-Sulla/python-frozendict/blob/master/test/debug.py
The problem is it does _not_ crash, while a get a segfault using
pytest with python 3.9 on MacOS 10.15
Maybe it's because I'm using eval / exec in the script?
On Sat, 20 Nov 202
Emh, maybe I was not clear. I created a C extension and it segfaults.
So I created that script to see where it segfaults. But the script
does not segfault. My doubt is: is that because I'm using eval and
exec in the script?
On Sat, 18 Dec 2021 at 18:33, Dieter Maurer wrote:
>
> Marco
In Python 3.7, must Py_TRASHCAN_SAFE_BEGIN - Py_TRASHCAN_SAFE_END be
used in a C extension?
I'm asking because in my C extension I use them in the deallocator
without problems, but users signalled me that they segfault in Python
3.7 on Debian 10. I checked and this is true.
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Yes, it's deprecated, but I need it for Python 3.7, since there was
yet no Py_TRASHCAN_BEGIN / END
On Tue, 21 Dec 2021 at 23:22, Barry wrote:
>
>
>
> On 21 Dec 2021, at 22:08, Marco Sulla wrote:
>
> In Python 3.7, must Py_TRASHCAN_SAFE_BEGIN - Py_TRASHCAN_SAFE_END be
Use a semaphore.
On Sun, 26 Dec 2021 at 03:30, iMath wrote:
>
> Normally, the shelve data should be read and write by only one process at a
> time, but unfortunately it was simultaneously read and write by two
> processes, thus corrupted it. Is there any way to recover all data in it ?
> Curre
I have to use _PyObject_GC_IS_TRACKED(). It can't be used unless you
define Py_BUILD_CORE. I want to avoid this. What macro or function can
substitute it?
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I need it since I'm developing an immutable dict. And in dict that
function is used.
I do not understand why there's no public API for that function. It
seems very useful.
On Sun, 26 Dec 2021 at 17:28, Barry Scott wrote:
>
>
>
> > On 26 Dec 2021, at 13:48, Marco Sulla
Hi, Inada Senpai. So I do not need PyObject_GC_Track on cloning or
merging, or MAINTAIN_TRACKING on insert?
On Tue, 28 Dec 2021 at 07:58, Inada Naoki wrote:
>
> On Tue, Dec 28, 2021 at 3:31 AM Marco Sulla
> wrote:
> >
> > I need it since I'm developing an immuta
I think it's very boring that, after creating a venv, you have
immediately to do every time:
pip install -U pip
Can't venv have an option for doing this automatically or, better, a
config file where you can put commands that will be launched every
time after you create a venv?
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On Tue, 28 Dec 2021 at 12:38, Inada Naoki wrote:
> Your case is special.
> You want to create a frozendict which performance is same to builtin dict.
> Builtin dict has special optimization which tightly coupled with
> current CPython implementation.
> So you need to use private APIs for MAINTAIN_
On Wed, 29 Dec 2021 at 00:03, Dieter Maurer wrote:
> Why do you not derive from `dict` and override its mutating methods
> (to raise a type error after initialization is complete)?
I've done this for the pure py version, for speed. But in this way,
frozendict results to be a subclass of MutableMa
On Wed, 29 Dec 2021 at 07:46, Inada Naoki wrote:
> You are right. I thought PyObject_GC_Track() can be used to tracked
> objects because PyObject_GC_Untrack() can be used untracked object.
> I think there is no enough reason for this asymmetry.
>
> Additionally, adding PyObject_GC_IsTracked() to p
Cool, thanks!
On Wed, 29 Dec 2021 at 07:10, Inada Naoki wrote:
>
> You can use --upgrade-deps option. My alias is:
>
> alias mkvenv='python3 -m venv --upgrade-deps --prompt . venv'
>
> On Wed, Dec 29, 2021 at 4:55 AM Marco Sulla
> wrote:
> >
> > I th
On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
>
> Marco Sulla wrote at 2021-12-29 08:08 +0100:
> >On Wed, 29 Dec 2021 at 00:03, Dieter Maurer wrote:
> >> Why do you not derive from `dict` and override its mutating methods
> >> (to raise a type error af
c 2021 at 09:24, Marco Sulla wrote:
>
> On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
> >
> > Marco Sulla wrote at 2021-12-29 08:08 +0100:
> > >On Wed, 29 Dec 2021 at 00:03, Dieter Maurer wrote:
> > >> Why do you not derive from `dict` and override it
On Wed, 29 Dec 2021 at 10:06, Dieter Maurer wrote:
>
> Are you sure you need to implement your type in C at all?
It's already implemented, and, in some cases, is faster than dict:
https://github.com/Marco-Sulla/python-frozendict#benchmarks
PS: I'm doing a refactoring that sp
I noticed that now freelists in dict use _Py_dict_state. I suppose
this is done for thread safety.
I would implement it also for a C extension that uses CPython < 3.10.
How can I achieve this?
--
https://mail.python.org/mailman/listinfo/python-list
On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
> `MutableMapping` is a so called abstract base class (--> `abc`).
>
> It uses the `__subclass_check__` (and `__instance_check__`) of
> `abc.ABCMeta` to ensure `issubclass(dict, MutableMapping)`.
> Those can be customized by overriding `MutableMap
On Wed, 29 Dec 2021 at 12:11, Dieter Maurer wrote:
>
> Marco Sulla wrote at 2021-12-29 11:59 +0100:
> >On Wed, 29 Dec 2021 at 09:12, Dieter Maurer wrote:
> >> `MutableMapping` is a so called abstract base class (--> `abc`).
> >>
> >> It uses the `__subcl
On Wed, 29 Dec 2021 at 18:33, iMath wrote:
> But I found the size of the file of the shelve data didn't change much, so I
> guess the data are still in it , I just wonder any way to recover my data.
I agree with Barry, Chris and Avi. IMHO your data is lost. Unpickling
it by hand is a harsh work
It was already done: https://pypi.org/project/tail-recursive/
On Thu, 30 Dec 2021 at 16:00, hongy...@gmail.com wrote:
>
> I try to compute the factorial of a large number with tail-recursion
> optimization decorator in Python3. The following code snippet is converted
> from the code snippet giv
I agree with Barry. You can create a folder or a file with
pseudo-random names. I recommend you to use str(uuid.uuid4())
On Sat, 1 Jan 2022 at 14:11, Barry wrote:
>
>
>
> > On 31 Dec 2021, at 17:53, iMath wrote:
> >
> > 在 2021年12月30日星期四 UTC+8 03:13:21， 写道：
> >>> On Wed, 29 Dec 2021 at 18:33, iM
I created a type in a C extension, that is an immutable dict. If I do:
a: mydict[str, str]
it works. But it doesn't work with mypy, as signalled to me by an user:
https://github.com/Marco-Sulla/python-frozendict/issues/39
How can I make it work? I don't know what he means with
Ooookay, I suppose I have to study a little the thing :D
On Thu, 30 Dec 2021 at 07:59, Inada Naoki wrote:
>
> On Wed, Dec 29, 2021 at 7:25 PM Marco Sulla
> wrote:
> >
> > I noticed that now freelists in dict use _Py_dict_state. I suppose
> > this is done for thread sa
#if defined(RANDALL_WAS_HERE)
# define Py_UNREACHABLE() \
Py_FatalError( \
"If you're seeing this, the code is in what I thought was\n" \
"an unreachable state.\n\n" \
"I could give you advice for what to do, but honestly, why\n" \
"should you trust me? I clear
https://askubuntu.com/questions/584857/distutilsextra-problem
On Sun, 2 Jan 2022 at 18:52, hongy...@gmail.com wrote:
>
> On Ubuntu 20.04.3 LTS, I try to install pdfarranger [1] as follows but failed:
>
> $ sudo apt-get install python3-pip python3-distutils-extra \
>
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