🌐 Mailman 3 November 2021 - Python-list - python.org

Re: Negative subscripts
by Pieter van Oostrum Nov. 26, 2021

Nov. 26, 2021

Frank Millman <frank(a)chagford.com> writes: > Hi all > > In my program I have a for-loop like this - > >>>> for item in x[:-y]: > ... [do stuff] > > 'y' may or may not be 0. If it is 0 I want to process the entire list > 'x', but of course -0 equals 0, so it returns an empty list. > > In theory I can say > >>>> for item in x[:-y] if y else x: > ... [do stuff] > > But in my actual program, both x and y are fairly long expressions, so > the result is pretty ugly. > > Are there any other techniques anyone can suggest, or is the only > alternative to use if...then...else to cater for y = 0? If you put it in a function with x and y as parameters, then both x and y are just a simple identifier inside the function. And then you can then even eliminate the if with for item in x[:len(x)-y]: -- Pieter van Oostrum <pieter(a)vanoostrum.org> www: http://pieter.vanoostrum.org/ PGP key: [8DAE142BE17999C4]

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Re: Negative subscripts
by Edmondo Giovannozzi Nov. 26, 2021

Nov. 26, 2021

Il giorno venerdì 26 novembre 2021 alle 10:23:46 UTC+1 Frank Millman ha scritto: > Hi all > > In my program I have a for-loop like this - > > >>> for item in x[:-y]: > ... [do stuff] > > 'y' may or may not be 0. If it is 0 I want to process the entire list > 'x', but of course -0 equals 0, so it returns an empty list. > > In theory I can say > > >>> for item in x[:-y] if y else x: > ... [do stuff] > > But in my actual program, both x and y are fairly long expressions, so > the result is pretty ugly. > > Are there any other techniques anyone can suggest, or is the only > alternative to use if...then...else to cater for y = 0? > > Thanks > > Frank Millman First assign your long expressions to variables x and y and then you may write: for item in x[:len(x) - y]: ...

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Re: pyinstaller wrong classified as Windows virus
by Ulli Horlacher Nov. 25, 2021

Nov. 25, 2021

Barry Scott <barry(a)barrys-emacs.org> wrote: > > > > On 25 Nov 2021, at 09:20, Ulli Horlacher <framstag(a)rus.uni-stuttgart.de> wrote: > > > > When I compile my programs with pyinstaller, Windows classifies them as > > virus and even deletes them! > > Microsoft will fix the malware detection if you provide the info they need. > > Submit false positive info to: https://www.microsoft.com/security/portal/submission/submit.aspx <https://www.microsoft.com/security/portal/submission/submit.aspx> I cannot submit my executables, because the Windows Virus scannners deletes them as soon as I compile my program! And I need a Microsoft login to submit a file! I do not have such a login. -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher(a)tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/

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pyinstaller wrong classified as Windows virus
by Ulli Horlacher Nov. 25, 2021

Nov. 25, 2021

When I compile my programs with pyinstaller, Windows classifies them as virus and even deletes them! pyinstaller.exe --onefile --noconsole -i fex.ico fextasy.py 187 INFO: PyInstaller: 4.7 187 INFO: Python: 3.10.0 218 INFO: Platform: Windows-10-10.0.19041-SP0 218 INFO: wrote P:\W10\fextasy.spec (...) 14392 INFO: Copying 0 resources to EXE 14392 INFO: Emedding manifest in EXE 14392 INFO: Updating manifest in P:\W10\dist\fextasy.exe 14533 INFO: Updating resource type 24 name 1 language 0 14579 INFO: Appending PKG archive to EXE 18836 INFO: Building EXE from EXE-00.toc completed successfully. https://fex.flupp.org/fop/ylds7Y9d/X-20211125101112.png What can I do? Rebooting does not help :-} -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher(a)tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/

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Re: pyinstaller: icon not visable on desktop?
by Ulli Horlacher Nov. 24, 2021

Nov. 24, 2021

Calvin Spealman <cspealma(a)redhat.com> wrote: > What version of Windows is this on? That's probably going to be a useful > bit of information, because there could be differences there to how EXE > icons are handled. > > On Tue, Nov 23, 2021 at 4:18 PM Ulli Horlacher < > framstag(a)rus.uni-stuttgart.de> wrote: > > > When I compile a python program with pyinstaller, I get an executable: > > > > pyinstaller --onefile --icon fex.ico fextasy.py > > > > But the executables icon is only visable within the windows file browser, > > not on the desktop: > > > > https://fex.flupp.org/fop/V2ioMZcl/X-20211123213712.png Python says: Windows 10.0.19041 -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher(a)tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/

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Embedding Python crash on PyTuple_New
by Arnaud Loonstra Nov. 24, 2021

Nov. 24, 2021

Hi, I've got Python embedded successfully in a program up until now as I'm now running into weird GC related segfaults. I'm currently trying to debug this but my understanding of CPython limits me here. I'm creating a Tuple in C but it crashes on creating it after a while. It doesn't make sense which makes me wonder something else must be happening? Could be it just crashes here because the GC is cleaning up stuff completely unrelated to the allocation of the new tuple? How can I troubleshoot this? I've got CPython compiled with --with-valgrind --without-pymalloc --with-pydebug In C I'm creating a tuple with the following method: static PyObject * s_py_zosc_tuple(pythonactor_t *self, zosc_t *oscmsg) { assert(self); assert(oscmsg); char *format = zosc_format(oscmsg); PyObject *rettuple = PyTuple_New((Py_ssize_t) strlen(format) ); It segfaults here (frame 16) after 320 times (consistently) 1 __GI_raise raise.c 49 0x7ffff72c4e71 2 __GI_abort abort.c 79 0x7ffff72ae536 3 fatal_error pylifecycle.c 2183 0x7ffff7d84b4f 4 Py_FatalError pylifecycle.c 2193 0x7ffff7d878b2 5 _PyObject_AssertFailed object.c 2200 0x7ffff7c93cf2 6 visit_decref gcmodule.c 378 0x7ffff7dadfd5 7 tupletraverse tupleobject.c 623 0x7ffff7ca3e81 8 subtract_refs gcmodule.c 406 0x7ffff7dad340 9 collect gcmodule.c 1054 0x7ffff7dae838 10 collect_with_callback gcmodule.c 1240 0x7ffff7daf17b 11 collect_generations gcmodule.c 1262 0x7ffff7daf3f6 12 _PyObject_GC_Alloc gcmodule.c 1977 0x7ffff7daf4f2 13 _PyObject_GC_Malloc gcmodule.c 1987 0x7ffff7dafebc 14 _PyObject_GC_NewVar gcmodule.c 2016 0x7ffff7daffa5 15 PyTuple_New tupleobject.c 118 0x7ffff7ca4da7 16 s_py_zosc_tuple pythonactor.c 366 0x55555568cc82 17 pythonactor_socket pythonactor.c 664 0x55555568dac7 18 pythonactor_handle_msg pythonactor.c 862 0x55555568e472 19 pythonactor_handler pythonactor.c 828 0x55555568e2e2 20 sphactor_actor_run sphactor_actor.c 855 0x5555558cb268 ... <More> Any pointer really appreciated. Rg, Arnaud

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pyinstaller: icon not visable on desktop?
by Ulli Horlacher Nov. 24, 2021

Nov. 24, 2021

When I compile a python program with pyinstaller, I get an executable: pyinstaller --onefile --icon fex.ico fextasy.py But the executables icon is only visable within the windows file browser, not on the desktop: https://fex.flupp.org/fop/V2ioMZcl/X-20211123213712.png There is only the default pyinstaller icon. Why? -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher(a)tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/

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Subprocess Connection error
by nuu.05.05＠gmail.com Nov. 23, 2021

Nov. 23, 2021

Hello, I have been 3.8.10 version of python until I ran the code for tkinter and I started getting subprocess connection error. After this I haven’t been able to open python for use as I get this error upon startup. Please help resolve the matter soon. Best regards, Nuha

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Re: Unexpected behaviour of math.floor, round and int functions (rounding)
by ast Nov. 23, 2021

Nov. 23, 2021

Le 19/11/2021 à 21:17, Chris Angelico a écrit : > On Sat, Nov 20, 2021 at 5:08 AM ast <ast@invalid> wrote: >> >> Le 19/11/2021 à 03:51, MRAB a écrit : >>> On 2021-11-19 02:40, 2QdxY4RzWzUUiLuE(a)potatochowder.com wrote: >>>> On 2021-11-18 at 23:16:32 -0300, >>>> René Silva Valdés <rene.silva.valdes(a)gmail.com> wrote: >>>> >> >> >>> 0.3 + 0.3 + 0.3 == 0.9 >> False > > That's because 0.3 is not 3/10. It's not because floats are > "unreliable" or "inaccurate". It's because the ones you're entering > are not what you think they are. > > When will people understand this? > > (Probably never. Sigh.) > > ChrisA > I posted that to make people aware of danger of float comparison, not because I was not understanding what happened. We can see there is a difference on the lsb, due to rounding. >>> (0.3+0.3+0.3).hex() '0x1.cccccccccccccp-1' >>> 0.9.hex() '0x1.ccccccccccccdp-1' >>> An isclose() function is provided in module math to do float comparison safely. >>> math.isclose(0.3+0.3+0.3, 0.9) True

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About get_axes() in Pandas 1.2.3
by Mahmood Naderan Nov. 22, 2021

Nov. 22, 2021

Hi I asked a question some days ago, but due to the lack of minimal producing code, the topic got a bit messy. So, I have decided to ask it in a new topic with a clear minimum code. With Pandas 1.2.3 and Matplotlib 3.3.4, the following plot() functions returns error and I don't know what is wrong with that. import pandas as pd import csv,sys import matplotlib import matplotlib.pyplot as plt df = pd.read_csv('test.batch.csv') print(df) print("matplotlib version = ", matplotlib.__version__) print("pandas version = ", pd.__version__) print("sys version", sys.version_info) fig,axes = plt.subplots(2,1, figsize=(20, 15)) df.columns = range(1, len(df.columns)+1) # Ignore the column header row = df.iloc[0].astype(int) # First row in the dataframe plt.subplot(2, 1, 1) print("axes=", axes) print("axes[0]=", axes[0]) print("row=", row) ax1 = row.plot(ax=axes[0]) # Line chart <-- ERROR ax1.set_ylabel( 'test' ) plt.subplot(2, 1, 2) df2 = row.value_counts() df2.reindex().plot(kind='bar', ax=axes[1]) # Histogram plt.show() The output is $ cat test.batch.csv Value,Value 10,2 5,2 10,2 $ python3 test.py Value Value.1 0 10 2 1 5 2 2 10 2 matplotlib version = 3.3.4 pandas version = 1.2.3 sys version sys.version_info(major=3, minor=8, micro=10, releaselevel='final', serial=0) axes= [<AxesSubplot:> <AxesSubplot:>] axes[0]= AxesSubplot(0.125,0.53;0.775x0.35) row= 1 10 2 2 Name: 0, dtype: int64 Traceback (most recent call last): File "test.py", line 20, in <module> ax1 = row.plot(ax=axes[0]) # Line chart File "/home/mahmood/.local/lib/python3.8/site-packages/pandas/plotting/_core.py", line 955, in __call__ return plot_backend.plot(data, kind=kind, **kwargs) File "/home/mahmood/.local/lib/python3.8/site-packages/pandas/plotting/_matplotlib/__init__.py", line 61, in plot plot_obj.generate() File "/home/mahmood/.local/lib/python3.8/site-packages/pandas/plotting/_matplotlib/core.py", line 283, in generate self._adorn_subplots() File "/home/mahmood/.local/lib/python3.8/site-packages/pandas/plotting/_matplotlib/core.py", line 483, in _adorn_subplots all_axes = self._get_subplots() File "/home/mahmood/.local/lib/python3.8/site-packages/pandas/plotting/_matplotlib/core.py", line 903, in _get_subplots ax for ax in self.axes[0].get_figure().get_axes() if isinstance(ax, Subplot) AttributeError: 'NoneType' object has no attribute 'get_axes' Although the plot() crashes, I see that row and axes variables are valid. So, I wonder what is the workaround for this code without upgrading Pandas or Matplotlib. Any idea? Regards, Mahmood

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