🌐 Mailman 3 February 2023 - Python-list - python.org

'dn' saying "Welcome (to the list)"
by Hen Hanna Feb. 26, 2023

Feb. 26, 2023

On Thursday, March 4, 2021 dn wrote: > Hi, and welcome to the list. note that this is the very same rude guy ('dn') who is apparently the rudest of them all. note that this is the very same rude guy ('dn') who wants to shunt me away to the TUTOR list. ----------- i guess i'd consider being TUTOR'ed by 'dn' (or someone like it) if i can be paid $1000 / hour for it. Have others noticed this too? (it's often the guy who says "Welcome" that....) Whenever someone says "Welcome" to me (in this way), my alarm goes off. --------- a good way to explain it (the Phenomenon) is... it's an indication that he's itching to treat me as a Newbie... that he 's salivating because he senses an opportunity to MANsplain and WHITEsplain things to me.

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Re: Is there a more efficient threading lock?
by Dennis Lee Bieber Feb. 26, 2023

Feb. 26, 2023

On Sat, 25 Feb 2023 15:41:52 -0600, Skip Montanaro <skip.montanaro(a)gmail.com> declaimed the following: >concurrent.futures.ThreadPoolExecutor() with the default number of workers ( >os.cpu_count() * 1.5, or 12 threads on my system) to process each month, so >12 active threads at a time. Given that the process is pretty much CPU >bound, maybe reducing the number of workers to the CPU count would make Unless things have improved a lot over the years, the GIL still limits active threads to the equivalent of a single CPU. The OS may swap among which CPU as it schedules system processes, but only one thread will be running at any moment regardless of CPU count. Common wisdom is that Python threading works well for I/O bound systems, where each thread spends most of its time waiting for some I/O operation to complete -- thereby allowing the OS to schedule other threads. For CPU bound, use of the multiprocessing package may be more suited -- though you'll have to device a working IPC system transfer data to/from the separate processes (no shared objects as possible with threads). -- Wulfraed Dennis Lee Bieber AF6VN wlfraed(a)ix.netcom.com http://wlfraed.microdiversity.freeddns.org/

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creepy email... Subj: Just to you.
by Hen Hanna Feb. 26, 2023

Feb. 26, 2023

i received this creepy email... Subj: Just to you. >>> Just to you as I see little further reason to help you ........... >>> You have not taken hints that bashing the language as not doing what you expect is not the way to get help so I leave you to others. i'll check (!) if he actually said anything helpful or informative !

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Programming by contract.
by Weatherby,Gerard Feb. 26, 2023

Feb. 26, 2023

The discussion of asserts got me thinking about Programming by Contract. Back in the 90s, I had occasion to learn Eiffel programming language. ( https://en.wikipedia.org/wiki/Eiffel_(programming_language) The concepts are intriguing, although Eiffel itself had barriers to widespread adoption. Reviewing the topic, I found Wikipedia mentioned some Python implementations. I kicked the tires of “deal” and found it straightforward. I’m wondering if anyone on the list has experience using any of the Programming by Contract modules? #!/usr/bin/env python3 import argparse import deal @deal.pre(lambda x: x > 7) @deal.pre(lambda x: isinstance(x, int)) def func(x): print(x) parser = argparse.ArgumentParser(formatter_class=argparse.ArgumentDefaultsHelpFormatter) parser.add_argument('--nodeal', action='store_true', help="Disable deal") parser.add_argument('bad_choice', choices=('type', 'value')) args = parser.parse_args() if args.nodeal: deal.disable() func(8) if args.bad_choice == 'type': func("8") if args.bad_choice == 'value': func(1)

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Why doesn't Python (error msg) tell me WHAT the actual (arg) values are ?
by Hen Hanna Feb. 26, 2023

Feb. 26, 2023

> py bug.py Traceback (most recent call last): File "C:\Usenet\bug.py", line 5, in <module> print( a + 12 ) TypeError: can only concatenate str (not "int") to str Why doesn't Python (error msg) do the obvious thing and tell me WHAT the actual (offending, arg) values are ? In many cases, it'd help to know what string the var A had , when the error occurred. ------------ i wouldn't have to put print(a) just above, to see. ( pypy doesn't do that either, but Python makes programming (debugging) so easy that i hardly feel any inconvenience.)

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Is there a more efficient threading lock?
by Skip Montanaro Feb. 25, 2023

Feb. 25, 2023

I have a multi-threaded program which calls out to a non-thread-safe library (not mine) in a couple places. I guard against multiple threads executing code there using threading.Lock. The code is straightforward: from threading import Lock # Something in textblob and/or nltk doesn't play nice with no-gil, so just # serialize all blobby accesses. BLOB_LOCK = Lock() def get_terms(text): with BLOB_LOCK: phrases = TextBlob(text, np_extractor=EXTRACTOR).noun_phrases for phrase in phrases: yield phrase When I monitor the application using py-spy, that with statement is consuming huge amounts of CPU. Does threading.Lock.acquire() sleep anywhere? I didn't see anything obvious poking around in the C code which implements this stuff. I'm no expert though, so could easily have missed something. Thx, Skip

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Re: TypeError: can only concatenate str (not "int") to str
by Hen Hanna Feb. 25, 2023

Feb. 25, 2023

On Saturday, February 25, 2023 at 1:54:14 PM UTC-8, Paul Rubin wrote: > Hen Hanna <henh...(a)gmail.com> writes: > > is this guy (dn) always this rude??? is he even more rude on this > > Python-Tutor list ? > I'm not on either list but the purpose of the tutor list is to shunt > beginner questions away from the main list. Yes your questions do seem > excessively frequent even here on Usenet. I have mostly been ignoring > them after seeing the first few. not sure... what you mean by "either" list.... this rude guy ('dn' who writes poorly) is someone i want to see posting less (and fewer), and (from what i've seen) , Paul Rubin is someone i wish to see posting more.

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Re: Is there a more efficient threading lock?
by Jon Ribbens Feb. 25, 2023

Feb. 25, 2023

On 2023-02-25, Paul Rubin <no.email(a)nospam.invalid> wrote: > Skip Montanaro <skip.montanaro(a)gmail.com> writes: >> from threading import Lock > > 1) you generally want to use RLock rather than Lock Why? > 2) I have generally felt that using locks at the app level at all is an > antipattern. The main way I've stayed sane in multi-threaded Python > code is to have every mutable strictly owned by exactly one thread, pass > values around using Queues, and have an event loop in each thread taking > requests from Queues. > > 3) I didn't know that no-gil was a now thing and I'm used to having the > GIL. So I would have considered the multiprocessing module rather than > threading, for something like this. What does this mean? Are you saying the GIL has been removed?

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Re: TypeError: can only concatenate str (not "int") to str
by Hen Hanna Feb. 25, 2023

Feb. 25, 2023

> PS are you aware that there is a Python-Tutor list for the use of people learning Python? is this guy (dn) always this rude??? is he even more rude on this Python-Tutor list ? he must have a reputation (for being rude)... On Friday, February 24, 2023 at 7:41:44 PM UTC-8, dn wrote: > On 25/02/2023 09.36, Hen Hanna wrote: > > TypeError: can only concatenate str (not "int") to str > > > > thanks for the comments, --- esp. 2 or 3 (?) ppl who directly addressed it or commented on it. > If you haven't already, please review the Python Software Foundation's > Code of Conduct https://www.python.org/psf/conduct/ > > py and pypy don't tell me what the (offending) int is > > > > (even tho' it'd be easy to show me the int, or number) > > > > because a Tuple, List... may produce a long output and they don't want to deal with ways of abbreviating it (with ....... ) > > > > and because User-defined Class object may cause another error while printing it. > > > > > > > > _________________________________________ > > TypeError: can only join an iterable > > > > Here too it'd help me if pypy (Jeannie) could tell me what the offending data object is. > Observation: > - python doesn't tell you what you want > - correspondents are not telling you what you want and/or how you want > There's a common theme developing... > > Suggestion: if you want help, and at the frequency with which you've > been posting recently, would it be better not to sound like a 'troll'? > > > Please understand everyone here is volunteering time, in a bid to > provide you (and each-other) with benefit. > > Does the FACT that you have failed to answer several questions from > colleagues really entitle you to demand others only directly-address you > (and only your questions)? > > -- > Regards, > =dn

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Question about logging.config.dictConfig
by Ivan "Rambius" Ivanov Feb. 25, 2023

Feb. 25, 2023

Hello, I am trying to configure my loggers using dictConfig, but they do not print anything. Here are more details. I have several python scripts that use a similar logging setup. I put the common configuration in a separate module myloggingconf.py: # myloggingconf.py import logging def configure_logging(): default = logging.Formatter('%(asctime)s %(levelname)-7s %(name)s %(funcName)s %(message)s') consoleHandler = logging.StreamHandler() consoleHandler.setFormatter(default) rootLogger = logging.getLogger() rootLogger.addHandler(consoleHandler) rootLogger.setLevel(logging.INFO) Then I use it in the other scripts as: # uselog.py import logging import os from myloggingconf import configure_logging logger = logging.getLogger(os.path.basename(__file__)) def dosmth(): logger.debug("debug") logger.info("info") logger.warning("warning") logger.error("error") def main(): configure_logging() dosmth() if __name__ == '__main__': main() This works correctly and the log messages about INFO print out. Now I want to try dictConfig. I changed myloggingconf.configure_logging to: # myloggingconf.py import logging.config def configure_logging(): config = { 'version': 1, 'disable_existing_loggers': True, 'formatters': { 'default': { 'fmt': '%(asctime)s %(levelname)-7s %(name)s %(funcName)s %(message)s' } }, 'handlers': { 'stdout': { 'level': 'DEBUG', 'class': 'logging.StreamHandler', 'formatter': 'default', } }, 'loggers': { '': { 'handlers': ['stdout'], 'level': 'DEBUG' } } } logging.config.dictConfig(config) When I run uselog.py it prints nothing. I am wondering what is wrong with the second configuration. I will appreciate any help. Regards rambius -- Tangra Mega Rock: http://www.radiotangra.com

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