🌐 Mailman 3 July 2020 - Python-list - python.org

How to find code that causes a 'deprecated' warning?
by Chris Green July 30, 2020

July 30, 2020

I am getting the following warning from a program I have just converted from gtk 2 to gtk 3 :- (abook:58240): Gtk-WARNING **: 12:01:58.064: Theme parsing error: gtk.css:66:28: The :prelight pseudo-class is deprecated. Use :hover instead. How do I find what is causing the warning? I'm not using the prelight pseudo-class directly in my code anywhere. -- Chris Green ·

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Winreg
by R Pasco July 29, 2020

July 29, 2020

I'm running python 3.8 on Windows 8.1 x64. Running the following code produces no errors but does not add a key, name or value. I had no problems doing this using _wirreg under python 2.7. Any insight will be helpful. Code: =================== import winreg hive = winreg.HKEY_LOCAL_MACHINE keypath = 'SOFTWARE\\AAA_Newkey' host = None hosthive = winreg.ConnectRegistry( host, hive ) key = winreg.CreateKeyEx( hosthive, keypath, reserved=0, access=winreg.KEY_WRITE) winreg.SetValueEx( key, 'NewValueName', 0, winreg.REG_SZ, 'NewStringValue' ) key.Close() ===================

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How to diagnose import error when importing from .so file?
by Chris Green July 29, 2020

July 29, 2020

I have some Python Gtk 2 code I'm trying to convert to Python pygobject GTK 3. However I'm stuck on an import statement that fails:- import pyscand The error message is:- File "/usr/libexec/okimfputl.new/guicom.py", line 66, in <module> import pyscand ImportError: /usr/libexec/okimfpdrv/pyscand.so: undefined symbol: _Py_ZeroStruct pyscand is a .so file so I fear I may be a bit stuffed unless I can find the source code for it. However any other ideas would be most welcome. In fact looking for this error it seems that is is a Python version mismatch error and I need to recompile pyscand.so against Python 3. Is there no way to sort of convert it to Python 3 without having the source? -- Chris Green ·

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Windows and Subclassing - 'OverflowError': int too long to convert
by Eko palypse July 29, 2020

July 29, 2020

Hello, I am subclassing a scintilla window and it happens every now and then that I get an OverflowError. I've logged the message and could narrow down that it is a single windows message which causes this trouble. It's WM_ERASEBKGND. Now the confusing part for me is the following. According to MS WPARAM <https://docs.microsoft.com/en-us/windows/win32/winprog/windows-data-types> is an UINT_PTR which is defined as #if defined(_WIN64) typedef unsigned __int64 UINT_PTR; #else typedef unsigned int UINT_PTR; #endif wintypes.WPARAM is ctypes.c_ulonglong and is of size 8 on my system. I'm on a x64 Windows - so far as good, right? Now when I get this error the message I receive in this situation is always like this. hWnd=197364, msg=20, wParam=*18446744072652653190*, lParam=0 Traceback (most recent call last): File "_ctypes/callbacks.c", line 237, in 'calling callback function' File "<string>", line 121, in new_scintilla2_proc ctypes.ArgumentError: argument 4: <class 'OverflowError'>: int too long to convert I really doubt that 18446744072652653190 is a valid device context but who knows. The question is, why do I even get this OverflowError? If I do wintypes.WPARAM(18446744072652653190) I don't receive an exception and it is a valid 64bit value, isn't it? The code I'm using is this user32 = ctypes.WinDLL('user32', use_last_error=True) LRESULT = wintypes.LPARAM WND_PROC = ctypes.WINFUNCTYPE(LRESULT, wintypes.HWND, wintypes.UINT, wintypes.WPARAM, wintypes.LPARAM) user32.CallWindowProcW.restype = LRESULT user32.CallWindowProcW.argtypes = [WND_PROC, wintypes.HWND, wintypes.UINT, wintypes.WPARAM, wintypes.LPARAM] Any idea what might have caused this? Thank you for reading Eren

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RE: Local access to a file, How To ?
by Steve July 29, 2020

July 29, 2020

I have a python program that reads and writes to files that are all within the folder that contains the python program. There is now a second python program that is to be run to compile information in said files. I am having difficulty trying to call the local supporting program from within the main program. I would it would found easily because everything is all in the same folder. Apparently, I have to decipher paths to do the task. One problem is that the project is portable on a thumb drive and the path can change based on the computer on which the program is executed. I look up use of path and I seem to get all absolute path instruction and not relative. Where an I steering wrongly here. Steve Footnote: In 10 years, are these going to be the "good old times" that we are living right now?

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Confused by python gtk, gobject, gi, etc. (Ubuntu repositories)
by Chris Green July 29, 2020

July 29, 2020

I am trying to move some code from Python 2, gtk 2 (I think!) to Python 3. I am very confused as to what Ubuntu repository packages I need to install to provide the Python 3 modules I need. Searching in the repositories (and descriptions) for pygobject what I find is:- python-gi-dev/focal 3.36.0-1 amd64 development headers for GObject Python bindings python-glade2/focal 2.24.0-0~201711230314~ubuntu18.04.1 amd64 GTK+ bindings: Glade support python-gobject-2-dev/focal,focal 2.28.6-14ubuntu1 all development headers for the static GObject Python bindings python-gtk2/focal,now 2.24.0-0~201711230314~ubuntu18.04.1 amd64 [installed] Python bindings for the GTK+ widget set python-gtk2-dbg/focal 2.24.0-0~201711230314~ubuntu18.04.1 amd64 Python bindings for the GTK+ widget set (debug extension) python-gtk2-dev/focal,focal 2.24.0-0~201711230314~ubuntu18.04.1 all GTK+ bindings: devel files python-gtk2-doc/focal,focal 2.24.0-0~201711230314~ubuntu18.04.1 all Python bindings for the GTK+ widget set - documentation python-gtkspellcheck/focal,focal 3.0-0~3~ubuntu14.04.1 all spellchecking library written in Python for Gtk based on Enchant python-gtkspellcheck-doc/focal,focal 4.0.5-2 all Python GTK+ Spellcheck common documentation python3-gtkspellcheck/focal,focal 4.0.5-2 all Python 3 spellchecking library for GTK+ based on Enchant python3-hinawa-utils/focal,focal 0.2.0-1 all Library to control Audio and Music units on FireWire (IEEE1394) So what do I need to install to get what I need? Is it python3-gi? I think it is but I'm not at all sure! Also, where do I find the pygi-convert.sh script? I have python3-gi installed but I don't have pygi-convert.sh. -- Chris Green ·

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The speed of glob()
by Gisle Vanem July 29, 2020

July 29, 2020

Has anybody noticed the speed of 'glob()' has decreased somewhere between v3.6 and v3.10. With this little test: ------------ import os, sys, timeit, glob # change to suite globPath = u'e:/net/*/*/*/*' def _glob(): glob.glob (globPath) # I used this 'https://docs.microsoft.com/en-gb/sysinternals/downloads/sync' def flush_disks(): sync = r"f:\ProgramFiler\Sysinternals\sync.exe -nobanner" print ("Exec sync: %s" % sync) os.system (sync) flush_disks() print ("Python %d.%d.%d:" % sys.version_info[:3]) print (" 1st run: %.5f" % timeit.timeit (_glob, number=1)) print (" 2nd run: %.5f" % timeit.timeit (_glob, number=1)) ------------ I got these results: Python 3.6.5: 1st run: 0.14694 2nd run: 0.09506 <- *always* the fastest Python 3.7.7: <- from Nuget 1st run: 0.12440 2nd run: 0.09602 Python 3.10.0: <- from Git repo 1st run: 0.15922 2nd run: 0.12424 'glob()' in Python 3.6.5 is consistently 30% faster on the 2nd run compared to 3.10.0. -- --gv

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How to pass options to "make test"?
by Marco Sulla July 29, 2020

July 29, 2020

After building CPython from source, I run the regression test suite, using make test (I'm on Linux). Now I would run only some tests, and pass a custom option (-R :) I tried TESTOPTS="test_pickle" make test without success. I had to do: ./python -u -bb -E -Wd -m test -r --fail-env-changed -w -j 0 test_pickle This works, but I would specify only custom options. PS: -R option finds reference leaks (python -m test --help explains it)

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Support both asyncio and synchronous callers
by Damian Johnson July 28, 2020

July 28, 2020

Hi. I'm the author of Stem, Tor's python library [1]. Recently we migrated to asyncio, but desire to still be usable by synchronous callers. We wrote a mixin [2][3] that transparently makes any class usable by both asyncio and synchronous callers... ====================================================================== import asyncio import stem.util.asyncio class Example(stem.util.asyncio.Synchronous): async def hello(self): return 'hello' def sync_demo(): instance = Example() print('%s from a synchronous context' % instance.hello()) instance.stop() async def async_demo(): instance = Example() print('%s from an asynchronous context' % await instance.hello()) instance.stop() sync_demo() asyncio.run(async_demo()) ====================================================================== Is there a better way to approach this? Our wider ecosystem seem to be forking networking libraries into sync/async variants, with requests [4] and AIOHTTP [5] as the most prominent. Are there any libraries out there that demonstrate good support for both kinds of callers without duplicating their API? Thanks! -Damian PS. I apologize if this email gets duplicated. Initially I used a different email address which Mailman seemed to decline. [1] https://stem.torproject.org/ [2] https://gitweb.torproject.org/stem.git/tree/stem/util/asyncio.py [3] https://gitweb.torproject.org/stem.git/tree/test/unit/util/asyncio.py [4] https://requests.readthedocs.io/en/master/ [5] https://docs.aiohttp.org/en/latest/index.html

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Dowloading package dependencies from locked down machine
by Andrew McLean July 28, 2020

July 28, 2020

At work my only Internet access is via a locked-down PC. The IT department are not willing to install Python on it [1]. Ideally I would download packages and their dependencies from PyPi using "pip download" at the command line. Any better solutions than downloading the package in a browser, finding its dependencies manually, downloading these and so on recursively? My dream solution would be for PyPi to provide a link to a zip file that bundled up a package and its dependencies, but I realise that this is probably a very niche requirement. - Andrew [1] Apparently they think installing Python would be incompatible with their Cyber Essentials Plus security accreditation, although it's apparently fine to have Microsoft Office 365 with a build in VBA interpreter!

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