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Sergey Bon. added the comment:
Documentation says:
%U - Week number of the year (Sunday as the first day of the week)
%W - Week number of the year (Monday as the first day of the week)
It wouldn't be intuitive if %U assumed Sunday when weekday provided and Monday
otherwise. There ar
Sergey Bon. added the comment:
Not following msg332388 would lead to this:
# Sunday of the week 53
>>> datetime.strptime ('2017 Sun 53', '%Y %a %U')
datetime.datetime(2017, 12, 31, 0, 0)
# First day of the week 53
# oops! assumed Monday is the first day of the
Sergey Bon. added the comment:
If %W and %U are allowed to be used without specifying the weekday by assuming
it to be the first day of the week, then the same rule should apply to %V (ISO
8601 week) for consistency.
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Sergey Shashkov added the comment:
This patch actually fixes the problem:
https://bugs.python.org/issue35588
https://github.com/python/cpython/commit/3a374e0c5abe805667b71ffaaa7614781101ff4c
from fractions import Fraction
import operator
class Goo:
__radd__, __rdivmod__
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Change by Sergey Bon. :
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keywords: +patch, patch
pull_requests: +11294, 11295
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Change by Sergey Bon. :
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New submission from Sergey Fedoseev :
PyTuple_New() fills items array with NULLs to make usage of Py_DECREF() safe
even when array is not fully filled with real items.
There are multiple cases when this initialization step can be avoided to
improve performance. For example it gives such speed
Change by Sergey Fedoseev :
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pull_requests: +11952
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New submission from Sergey Fedoseev :
There are several cases in CPython sources when PyList_AsTuple() is used with
just created list and immediately after that this list is Py_DECREFed. This
operation can be performed more effectively since refcount of items is not
changed. For example it
Change by Sergey Fedoseev :
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Sergey Fedoseev added the comment:
Does this look like more real world example?
Before:
$ python -m perf timeit -s "t = (1, 2, 3)" "(*t, 4, 5)"
.
Mean +- std dev: 95.7 ns +- 2.3 ns
After:
$ python -m perf timeit -s "t = (1, 2, 3)" "(*t
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Sergey Fedoseev added the comment:
Here's benchmarks for PyTuple_FromArray() PR:
$ python -m perf timeit -s "l = [None]*0; tuple_ = tuple" "tuple_(l)"
--duplicate=100 --compare-to=../cpython-master/venv/bin/python
/home/sergey/tmp/cpython-master/venv/bin/python: .
New submission from Sergey Fedoseev :
list_slice() is used by PyList_GetSlice(), list_subscript() and for list
copying. In list_subscript() slice indices are already normalized with
PySlice_AdjustIndices(), so slice normalization currently performed in
list_slice() is only needed for
Change by Sergey Fedoseev :
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New submission from Sergey Fedoseev :
This change produces minor speed-up:
$ python-other -m perf timeit -s "divmod_ = divmod" "divmod_(1, 1)"
--duplicate=1000 --compare-to=../cpython-master/venv/bin/python
python: . 64.6 ns +-
Change by Sergey Fedoseev :
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New submission from Sergey Fedoseev :
In [186]: from itertools import cycle
In [187]: class ContainerLike:
...: def __init__(self):
...: self.chars = cycle('12')
...: def __getitem__(self, key):
...: return next(self.chars)
...:
Change by Sergey Fedoseev :
--
title: str.translate() behave differently for ASCII-only and other strings ->
str.translate() behaves differently for ASCII-only and other strings
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New submission from Sergey Fedoseev :
It's somewhat similar to bpo-10811, but for converter function:
In [197]: import sqlite3 as sqlite
...: con = sqlite.connect(':memory:', detect_types=sqlite.PARSE_COLNAMES)
...: cur = con.cursor()
...: sqlite.converte
Change by Sergey Fedoseev :
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pull_requests: +12008
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Sergey Fedoseev added the comment:
I added WIP PR with discussed micro-optimization, here are benchmark results:
$ python -m perf compare_to --min-speed 1 -G master.json tuple-untracked.json
Slower (1):
- sqlite_synth: 5.16 us +- 0.10 us -> 5.22 us +- 0.08 us: 1.01x slower (+1%)
Faster
Sergey Fedoseev added the comment:
This optimization also can be used for BUILD_TUPLE opcode and in pickle module,
if it's OK to add _PyTuple_StealFromArray() function :-)
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Sergey Fedoseev added the comment:
> Can you please convert msg336142 into a perf script?
> And then run again these benchmarks on PR 12052.
++-+--+
| Benchmark | ref | unt
Sergey Fedoseev added the comment:
>> This optimization also can be used for BUILD_TUPLE opcode and in pickle
>> module, if it's OK to add _PyTuple_StealFromArray() function :-)
> I would like to see a micro-benchmark show
Change by Sergey Fedoseev :
Added file: https://bugs.python.org/file48174/list_as_tuple_bench.py
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Change by Sergey Fedoseev :
Added file: https://bugs.python.org/file48173/build_tuple_bench.py
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New submission from Sergey Kostyuk :
Good day. I have a question (or proposal, if you like)
For now Mocks from unittest.mock module allows to mimic an interface of a some
class or object instance. They pass isinstance checks, they allows to wrap
callables with respect to their arguments. But
New submission from Sergey Fedoseev :
Before:
$ ./python -m timeit -s "from binascii import unhexlify; b = b'aa'*2**20"
"unhexlify(b)"
50 loops, best of 5: 5.68 msec per loop
After:
$ ./python -m timeit -s "from binascii import unhexlify; b = b'aa'
Change by Sergey Fedoseev :
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pull_requests: +4508
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Change by Sergey Fedoseev :
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Sergey Fedoseev added the comment:
Serhiy, did you use the same benchmark as mentioned here?
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Sergey Fedoseev added the comment:
> OS
x86_64 GNU/Linux
> compiler
gcc version 7.2.0 (Debian 7.2.0-16)
> CPU
Architecture:x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 4
On-line CPU(s) list: 0-3
Thread(s) per core: 2
Co
Sergey Fedoseev added the comment:
Is there anything I can do to push this forward?
BTW, Serhiy, what are your OS, compiler and CPU?
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New submission from Sergey Petrunin :
Library's function 'tarfile.is_tarfile' returns 'True' on GZip file (9.7
megabytes see attachment), that is a file with 10 gigabytes of '0' character
compressed with 'gzip' utility (no 'tar' whatsoev
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New submission from Sergey Fedoseev :
SQLite converters are documented to be sensitive to the case of type names, but
they're not.
In [50]: import sqlite3
...:
...: sqlite3.converters.clear()
...: sqlite3.register_converter('T', lambda x: 'UPPE
Change by Sergey Fedoseev :
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pull_requests: +7651
stage: -> patch review
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New submission from Sergey Fedoseev :
SQLiter 3.8.3 and higher allows to mark created functions as deterministic to
allow additional optimizations. There isn't currently a way to it from Python.
https://sqlite.org/c3ref/create_function.html
--
components: Extension Modules
mes
Change by Sergey Fedoseev :
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pull_requests: +7687
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<https://bugs.python.org/issue34041>
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New submission from Sergey Fedoseev :
In [1]: import sqlite3
In [2]: con = sqlite3.connect(':memory:')
In [3]: con.execute('SELECT f()')
---
OperationalError Traceback (most r
Change by Sergey Fedoseev :
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pull_requests: +7702
stage: -> patch review
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New submission from Sergey Fedoseev :
Currently list concatenation, slicing and repeating operations are using
PyList_New() which allocates memory for the items by calloc(). malloc() could
be used instead, since the allocated memory is overwritten by mentioned
operations.
I made benchmarks
Change by Sergey Fedoseev :
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pull_requests: +7869
stage: -> patch review
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<https://bugs.python.org/issue34151>
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New submission from Sergey Fedoseev :
Script for benchmarks:
NAME=list-slice.json
python -m perf timeit --name "l[len(l):] = reversed(l)" -l 1 -s "l = [None] *
100" "l[len(l):] = reversed(l)" --append $NAME
python -m perf timeit --name "l[len(l):] = l&
Change by Sergey Fedoseev :
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pull_requests: +7870
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Change by Sergey Fedoseev :
--
title: performance of some list slice assignment can be improved -> performance
of some list slice assignment margin cases can be improved
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New submission from Sergey Fedoseev :
pysqlite_build_row_cast_map() can crash on memory allocation failure:
1. it doesn't check that PyList_New() returns non-NULL
2. Py_DECREF() borrowed reference when
--
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messages: 322396
nosy: sir-sigurd
priority: n
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New submission from Sergey Fedoseev :
`PyTuple_SetItem()` can be replaced with macro version and `PyObject_Call()`
can be used instead of `PyEval_CallObject()`.
Here's benchmark results:
$ python -m perf timeit --compare-to ~/tmp/cpython-master-venv/bin/python -s
"from functo
Change by Sergey Fedoseev :
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pull_requests: +8107
stage: -> patch review
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Change by Sergey Fedoseev :
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pull_requests: +8140
stage: -> patch review
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New submission from Sergey Fedoseev :
There are memory leaks in csv and pickle modules caused by incautious usage of
PyMem_Resize().
See GitHub PR.
--
components: Extension Modules
messages: 323487
nosy: sir-sigurd
priority: normal
severity: normal
status: open
title: memory leaks in
Change by Sergey Fedoseev :
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pull_requests: +8232
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Change by Sergey Fedoseev :
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keywords: +patch
pull_requests: +8233
stage: -> patch review
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New submission from Sergey Fedoseev :
Max size of list and tuples is limited by PY_SSIZE_T_MAX / sizeof(PyObject*),
so the sum of any two list/tuples sizes always <= PY_SSIZE_T_MAX if
sizeof(PyObject*) > 1, which seems true for all supported (existing?) platforms.
It means that ov
Sergey Fedoseev added the comment:
> Could you elaborate a bit more on how/where the leak happens?
It happens when PyMem_Resize() fails. It was used like this:
Py_UCS4 *field = self->field;
self->field = PyMem_Resize(field, Py_UCS4, self->field_size);
The last statement chang
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New submission from Sergey Fedoseev :
Currently BytesIO.writelines() uses BytesIO.write() which returns number of
written bytes as Python ints, but these ints are not used by
BytesIO.writelines(), so avoiding creation of these ints can improve
performance of BytesIO.writelines() especially
Change by Sergey Fedoseev :
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pull_requests: +8374
stage: -> patch review
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New submission from Sergey Fedoseev :
Currently __reduce__() implementation of set and dict iterators saves items to
list using next/PyList_Append(), it could be simplified by using
PySequence_List().
--
components: Interpreter Core
messages: 324550
nosy: sir-sigurd
priority: normal
Change by Sergey Fedoseev :
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keywords: +patch
pull_requests: +8512
stage: -> patch review
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New submission from Sergey Fedoseev :
In [1]: from collections import OrderedDict
In [2]: od = OrderedDict.fromkeys(range(10))
In [3]: it = iter(od)
In [4]: it.__reduce__()
Out[4]: (, ([0, 1, 2, 3, 4, 5, 6, 7, 8, 9],))
In [5]: list(it)
Out[5]: []
--
messages: 324551
nosy: sir
Change by Sergey Fedoseev :
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pull_requests: +8513
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Sergey Fedoseev added the comment:
Other iterators either don't support pickling or aren't mutated during pickling:
In [10]: it = iter({1})
In [11]: pickle.dumps(it)
Out[11]:
b'\x80\x04\x95\x1e\x00\x00\x00\x00\x00\x00\x00\x8c\x08builtins\x94\x8c\x04iter\x94\x93\x94]\x94K\x0
New submission from Sergey Fedoseev :
Currently _Py_bytes_capitalize() checks case before using conversion table,
performance can be improved by using conversion table unconditionally.
Benchmarks:
$ python -m perf timeit --compare-to ~/tmp/cpython-master-venv/bin/python -s "b
Change by Sergey Fedoseev :
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pull_requests: +8541
stage: -> patch review
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Sergey Fedoseev added the comment:
> Now you rely on PyMem_Malloc() to detect the overflow.
Now overflow is not possible or am I missing something?
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New submission from Sergey Fedoseev :
I reworked implementation of binascii.a2b_base64() and there is significant
speedup:
$ python -m perf timeit --compare-to ~/tmp/cpython-master-venv/bin/python -s
"from binascii import b2a_base64, a2b_base64; s = b2a_base64(1000 * b'b')&
Change by Sergey Fedoseev :
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pull_requests: +8859
stage: -> patch review
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Sergey Vishnikin added the comment:
-cookie_re = re.compile("coding[:=]\s*([-\w.]+)")
+cookie_re = re.compile("#[^\r\n]*coding[:=]\s*([-\w.]+)")
Regex matches only if the encoding expression is preceded by a comment.
--
keywords: +patch
nosy: +armic
Changes by Sergey Vilgelm :
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Sergey Dorofeev added the comment:
I'd like to submit patch to support zip archives created on systems that use
non-US codepage (e.g. russian CP866).
Codepage would be specified in additional parameter of ZipFile constructor,
named "codepage".
If it is not specified, old behavi
Sergey Dorofeev added the comment:
OK, here you are:
--- zipfile.py-orig 2013-09-18 16:45:56.0 +0400
+++ zipfile.py 2013-10-19 01:59:07.444346674 +0400
@@ -885,7 +885,7 @@
fp = None # Set here since __del__ checks it
_windows_illegal_name_trans_table
New submission from Sergey Prigogin :
File "/usr/grte/v1/piii-linux/lib/python2.4/urllib.py", line 82, in
urlopen
return opener.open(url)
File "/usr/grte/v1/piii-linux/lib/python2.4/urllib.py", line 190, in open
return getattr(self, name)(url)
File "/u
Sergey Prigogin added the comment:
The problem is pretty obvious from the code.
URLopener.open_http contains the following code:
if data is not None:
h.send(data)
errcode, errmsg, headers = h.getreply()
fp = h.getfile()
if errcode == 200
Changes by Sergey Kirillov :
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New submission from Sergey Konoplev :
Hello,
I am starting to use argparse package and faced the problem where an optional
argument w/ nargs='+' conflicts w/ a positional argument.
Here is the test case:
>>> import argparse
>>> p = argparse.ArgumentParser()
&g
Sergey Konoplev added the comment:
Thank you for the hint. It is realy not so obvious.
May be it is worth to add "--" into the usage string this way
usage: [-h] [-b BAR [BAR ...]] -- foo
Otherwise it leads to misunderstanding.
--
Sergey Chvalyuk added the comment:
There is another limitation with os.walk
it also cannot go very deep inside tree because of scandir can throw
OSError(36, 'File name too long')
I have wrote tests for both cases:
https://gist.github.com/grubberr/3367f1d605e292103b576a17a46ef3c3
New submission from Sergey Litvinov:
Bisection algorithms use
mid = (lo+hi)//2
Textbook formula is
mid = (hi-lo)//2 + lo
See
http://en.wikipedia.org/w/index.php?title=Binary_search_algorithm&oldid=634658510#Arithmetic
For "vanilla" lists and integers it is not a problem but on
Sergey Litvinov added the comment:
mark.dickinson> do you have an example of the Lib/bisect.py code
No. I was thinking about something hypothetical similar to the one you
provided.
rhettinger> The "textbook" formula is more important in languages
rhettinger> without somethi
New submission from Sergey Shashkov:
__floordiv__ in module fraction fails with TypeError instead of returning
NotImplemented when modulo is a class without __rtruediv__ or __mul__.
Code sample:
class Foo(object):
def __rdivmod__(self, other):
return 'rdivmod works&#
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