Re: How to exit program with custom code and custom message?
On Tue, 14 Mar 2023 at 15:28, Thomas Passin wrote:
>
> On 3/13/2023 10:34 PM, scruel tao wrote:
> > Interesting, `raise SystemExit` seems to have the same behavior as
> > `sys.exit`:
> >
> > ```shell
> > python -c "raise SystemExit(100)"
> > echo $?
> > <<< 100
> >
> > python -c " import sys; sys.exit(100)"
> > echo $?
> > <<< 100
>
> OTOH, you don't want to get too tricky:
>
> (on Windows, obviously)
> C:\Users\tom>py -c "import sys; sys.exit(type(100) == type('a'))"
>
> C:\Users\tom>echo %ERRORLEVEL%
> 0
>
> Presumably we wouldn't want to get an exit value of 0 for this case!
>
Why? You passed the value False, which is 0. So it should behave as
documented, and exit 0.
ChrisA
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Re: How to exit program with custom code and custom message?
On 3/13/2023 10:34 PM, scruel tao wrote:
Interesting, `raise SystemExit` seems to have the same behavior as `sys.exit`:
```shell
python -c "raise SystemExit(100)"
echo $?
<<< 100
python -c " import sys; sys.exit(100)"
echo $?
<<< 100
OTOH, you don't want to get too tricky:
(on Windows, obviously)
C:\Users\tom>py -c "import sys; sys.exit(type(100) == type('a'))"
C:\Users\tom>echo %ERRORLEVEL%
0
Presumably we wouldn't want to get an exit value of 0 for this case!
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Re: How to exit program with custom code and custom message?
On 3/13/2023 11:50 PM, MRAB wrote: On 2023-03-14 03:29, Thomas Passin wrote: On 3/13/2023 10:34 PM, scruel tao wrote: Lars: I totally understand your reasoning here, but in some way it follows the unix philosophy: Do only one thing, but do that good. I understand, python is not strongly typed, so `sys.exit` will be able to accept any types parameters rather than just integer. In order to handle such “other” types logic, I think this function already violated the unix philosophy, and there is no way to avoid it. Most Python folks will say the Python *is* fairly strongly typed, but for a different definition of "type". That is, duck typing. It's strongly typed but not statically typed, unless you count type hints, which are optional. Yes, of course. That's pretty common knowledge. -- https://mail.python.org/mailman/listinfo/python-list
Re: How to exit program with custom code and custom message?
On 2023-03-14 03:29, Thomas Passin wrote: On 3/13/2023 10:34 PM, scruel tao wrote: Lars: I totally understand your reasoning here, but in some way it follows the unix philosophy: Do only one thing, but do that good. I understand, python is not strongly typed, so `sys.exit` will be able to accept any types parameters rather than just integer. In order to handle such “other” types logic, I think this function already violated the unix philosophy, and there is no way to avoid it. Most Python folks will say the Python *is* fairly strongly typed, but for a different definition of "type". That is, duck typing. It's strongly typed but not statically typed, unless you count type hints, which are optional. -- https://mail.python.org/mailman/listinfo/python-list
Re: How to exit program with custom code and custom message?
On 3/13/2023 10:34 PM, scruel tao wrote: Lars: I totally understand your reasoning here, but in some way it follows the unix philosophy: Do only one thing, but do that good. I understand, python is not strongly typed, so `sys.exit` will be able to accept any types parameters rather than just integer. In order to handle such “other” types logic, I think this function already violated the unix philosophy, and there is no way to avoid it. Most Python folks will say the Python *is* fairly strongly typed, but for a different definition of "type". That is, duck typing. -- https://mail.python.org/mailman/listinfo/python-list
Re: How to exit program with custom code and custom message?
Lars:
> I totally understand your reasoning here, but in some way it follows the unix
> philosophy: Do only one thing, but do that good.
I understand, python is not strongly typed, so `sys.exit` will be able to
accept any types parameters rather than just integer.
In order to handle such “other” types logic, I think this function already
violated the unix philosophy, and there is no way to avoid it.
Cameron:
> That kind of thing is an open ended can of worms. You're better off
> writing your own `aort()` function
Thank you for your advice and example, I applied such wrappers for many years,
this question comes more from “pythonic” discussion, because as I mentioned
above, `sys.exit` can accept any types.
> BTW, `sys.exit()` actually raises a `SystemExit` exception which is
> handled by the `sys.excepthook` callback which handles any exception
> which escapes from the programme uncaught.
Interesting, `raise SystemExit` seems to have the same behavior as `sys.exit`:
```shell
python -c "raise SystemExit(100)"
echo $?
<<< 100
python -c " import sys; sys.exit(100)"
echo $?
<<< 100
python -c "raise SystemExit('a’)"
<<< a
echo $?
<<< 1
python -c " import sys; sys.exit('a’)"
<<< a
echo $?
<<< 1
```
So, `sys.exit` is just a shortcut for `raise SystemExit`, or not? (Haven’t yet
check the cpython source code)
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Re: =- and -= snag
On 3/13/2023 9:47 PM, Chris Angelico wrote: On Tue, 14 Mar 2023 at 12:38, Thomas Passin wrote: On 3/13/2023 9:07 PM, Chris Angelico wrote: Of course, all this is predicated on you actually putting whitespace around your equals signs. If you write it all crunched together as "x=-5", there's no extra clues to work with. Linters and code reviewers can make use of all the available information, including whitespace, to determine programmer intent. This is the kind of thing that unit tests can catch. Maybe, but that's quite orthogonal. The linter would highlight the exact line of code with the odd whitespace; a unit test would merely point out that the overall behaviour is incorrect, which would have been no further information beyond what the OP already knew (the numbers weren't adding up). ChrisA *This* time the OP happened to know. People in the thread have been discussing how to pick this kind of mistake with linters or what have you. Even with a linter, whether or not this would have been picked up depends on how it has been configured. Really, the only defense against these kind of potential mistakes or typos is not to use constructions that may be more likely to get wrong (or be typoed). In this particular case, that would probably be too great a limitation for most of us. But the general principle is a good one. Douglas Crockford wrote a book on using just the better parts of Javascript (JavaScript: The Good Parts - rather dated by now but still worth the reading). Of course, anyone can have a brain blip on any given day! -- https://mail.python.org/mailman/listinfo/python-list
Re: =- and -= snag
On Tue, 14 Mar 2023 at 12:38, Thomas Passin wrote: > > On 3/13/2023 9:07 PM, Chris Angelico wrote: > > Of course, all this is predicated on you actually putting whitespace > > around your equals signs. If you write it all crunched together as > > "x=-5", there's no extra clues to work with. > > > > Linters and code reviewers can make use of all the available > > information, including whitespace, to determine programmer intent. > > This is the kind of thing that unit tests can catch. > Maybe, but that's quite orthogonal. The linter would highlight the exact line of code with the odd whitespace; a unit test would merely point out that the overall behaviour is incorrect, which would have been no further information beyond what the OP already knew (the numbers weren't adding up). ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: =- and -= snag
On 3/13/2023 9:07 PM, Chris Angelico wrote: Of course, all this is predicated on you actually putting whitespace around your equals signs. If you write it all crunched together as "x=-5", there's no extra clues to work with. Linters and code reviewers can make use of all the available information, including whitespace, to determine programmer intent. This is the kind of thing that unit tests can catch. -- https://mail.python.org/mailman/listinfo/python-list
RE: =- and -= snag
Morten, Suggesting something is UNPYTHONIC is really not an argument I take seriously. You wrote VALID code by the rules of the game and it is not a requirement that it guesses at what you are trying to do and calls you an idiot! More seriously, python lets you do some completely obscure things such as check whether some random object or expression is truthy or not. There is no way in hell the language, as defined, can catch all kinds of mistakes. Now some languages or their linters have chosen to provide warnings of code that may be valid but is often an error. Consider: x = 1 y = 0 x = y Do I want to rest x to the value of y? Maybe. Or do I want the interpreter to print out whether x == y perhaps? Well what if the third line above was x == y Is that too a warning? To add to the confusion some languages have an ===, :=, +=, -=, /=, |= or oddities like %=% and many of these are all variations on meanings vaguely related to equality before or after ... So, no, it is not only not unpythonic, in my opinion, but quite pythonic to let the interpreter interpret what you wrote and not know what you meant. Is there possible a flag that would require your code to use spaces in many places that might cut down on mistakes? There could be and so your example of something like "new =- old" might be asked to be rewritten as "new = - old" or even "new = (-old)" but for now, you may want to be more careful. I do sympathize with the problem of a hard to find bug because it LOOKS RIGHT to you. But it is what it is. Avi -Original Message- From: Python-list On Behalf Of Morten W. Petersen Sent: Monday, March 13, 2023 5:26 PM To: python-list Subject: =- and -= snag Hi. I was working in Python today, and sat there scratching my head as the numbers for calculations didn't add up. It went into negative numbers, when that shouldn't have been possible. Turns out I had a very small typo, I had =- instead of -=. Isn't it unpythonic to be able to make a mistake like that? Regards, Morten -- I am https://leavingnorway.info Videos at https://www.youtube.com/user/TheBlogologue Twittering at http://twitter.com/blogologue Blogging at http://blogologue.com Playing music at https://soundcloud.com/morten-w-petersen Also playing music and podcasting here: http://www.mixcloud.com/morten-w-petersen/ On Google+ here https://plus.google.com/107781930037068750156 On Instagram at https://instagram.com/morphexx/ -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: =- and -= snag
On 2023-03-14 00:28, Gary Herron wrote: On 3/13/23 2:26 PM, morp...@gmail.com wrote: Hi. I was working in Python today, and sat there scratching my head as the numbers for calculations didn't add up. It went into negative numbers, when that shouldn't have been possible. Turns out I had a very small typo, I had =- instead of -=. Isn't it unpythonic to be able to make a mistake like that? Regards, Morten These all mean the same thing, but I don't see a good way to designate the second or third as an error. x = -5 x=-5 x =- 5 The third one could be picked up as suspicious by a linter due to its unusual spacing. -- https://mail.python.org/mailman/listinfo/python-list
Re: =- and -= snag
On Tue, 14 Mar 2023 at 11:37, Gary Herron wrote: > > > On 3/13/23 2:26 PM, morp...@gmail.com wrote: > > Hi. > > > > I was working in Python today, and sat there scratching my head as the > > numbers for calculations didn't add up. It went into negative numbers, > > when that shouldn't have been possible. > > > > Turns out I had a very small typo, I had =- instead of -=. > > > > Isn't it unpythonic to be able to make a mistake like that? > > > > Regards, > > > > Morten > > > > These all mean the same thing, but I don't see a good way to designate > the second or third as an error. > > > x = -5 > x=-5 > x =- 5 > The second one isn't definitely an error, but the third is a failure of style. Many style guides mandate, for instance, equal whitespace either side of a binary operator. It's pretty straight-forward for a program to tokenize your code the exact same way that Python would, so it will interpret it thus: NAME "x" (whitespace " ") OP "=" OP "-" (whitespace " ") NUMBER "5" The whitespace parts aren't tokens in the normal sense, but worst case, you can count positions. And since there's one space prior to the "=" and none after, it violates the style rule, and can thus be flagged. (This is one reason that I detest autoformatters. You might notice the autoformatter relayout your code into "x = -5", but if you don't spot it right at that moment, there's a lower chance that it'll look like a problem. OTOH, something that simply flags the error and leaves it for you to fix, even if you don't notice it immediately, will bring this line to your attention and let you wonder whether it's misformatted or miscoded.) Of course, all this is predicated on you actually putting whitespace around your equals signs. If you write it all crunched together as "x=-5", there's no extra clues to work with. Linters and code reviewers can make use of all the available information, including whitespace, to determine programmer intent. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
Re: =- and -= snag
On 3/13/23 2:26 PM, morp...@gmail.com wrote: Hi. I was working in Python today, and sat there scratching my head as the numbers for calculations didn't add up. It went into negative numbers, when that shouldn't have been possible. Turns out I had a very small typo, I had =- instead of -=. Isn't it unpythonic to be able to make a mistake like that? Regards, Morten These all mean the same thing, but I don't see a good way to designate the second or third as an error. x = -5 x=-5 x =- 5 Dr. Gary Herron Professor of Computer Science DigiPen Institute of Technology -- https://mail.python.org/mailman/listinfo/python-list
=- and -= snag
Hi. I was working in Python today, and sat there scratching my head as the numbers for calculations didn't add up. It went into negative numbers, when that shouldn't have been possible. Turns out I had a very small typo, I had =- instead of -=. Isn't it unpythonic to be able to make a mistake like that? Regards, Morten -- I am https://leavingnorway.info Videos at https://www.youtube.com/user/TheBlogologue Twittering at http://twitter.com/blogologue Blogging at http://blogologue.com Playing music at https://soundcloud.com/morten-w-petersen Also playing music and podcasting here: http://www.mixcloud.com/morten-w-petersen/ On Google+ here https://plus.google.com/107781930037068750156 On Instagram at https://instagram.com/morphexx/ -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On Monday, 13 March 2023 at 16:12:04 UTC+1, Thomas Passin wrote: > On 3/13/2023 12:39 AM, a a wrote: > > But some unknown reasons Matplotlib and numpy crash my Python 3.8 for > > Windows , 32-bit and no support is offered > It is possible, using pip, to downgrade versions (e.g., of Matplotlob > and numpy) to see if you can find versions that work. Of course moving > to 64-bit Python >= 3.10 would be better, but if that were possible I > imagine you would have done it already. > > BTW, it would be useful if you said what operating system you are using > (I've been assuming Windows). sorry Windows 7 My concept in building Earthquake Prediction System based on Precognition is to use RTL Software Defined Radio (SDR) to receive data from outdoor seismic sensors (smartphones turned into seismographs - sending acceleration data via audio output, to be transmitted by radio transmitter to a remote RTL SDR station, for real time processing, P-wave energy envelope calculation, earthquake depth calculation sine in case of Turkey, USGS assigns 10km depth value by default to a single EQ event. Why SDR ? Since I don't expect Cellular network to work and be operational in remote, mountain regions of Turkey after the strong 7,8 earthquake, so SDR should work as backup for cellular 3G/LTE network in the region. In case of Android smartphones I need to switch to Python for Android to get flexibility offered by scripting to support earthquake study ideas just in time and to share such ideas with friends. --- python-for-android · PyPI https://pypi.org/project/python-for-android python-for-android is a packaging tool for Python apps on Android. You can create your own Python distribution including the modules and dependencies you want, and bundle it in an APK or AAB along with your own code. Features include: Different app backends including Kivy, PySDL2, and a WebView with Pyt… See more Documentation Follow the quickstartinstructionsto install and begin creating APKs and AABs. Quick instructions: install python-for-android with: (for the develop branch: pip install git+https://github.com/kivy/… See more Contributing We love pull requests and discussing novel ideas. Check out the Kivyproject contribution guideandfeel free to improve python-for-android. See ou… See more Support If you need assistance, you can ask for help on our mailing list: 1. User Group: https://groups.google.com/group/kivy-users 2. Email: kivy-us...@googlegroups.com … See more History In 2015 these tools were rewritten to provide a new, easier-to-use andeasier-to-extend interface. If you'd like to browse the old toolchain, itsstatus is re… See more Explore further Global web icon Is there a way to run Python on Android? - Stack Overflow stackoverflow.com Global web icon How to Download and Install Python for Android mptricks.com Global web icon How to develop Android app completely using python? stackoverflow.com Global web icon How to download and install Python Latest Version on An… geeksforgeeks.org Global web icon An Introduction to Python for Android Development pythonpool.com Recommended to you based on what's popular • Feedback From pypi.org Content Documentation Support Contributing History Create and run Python apps on your Android phone https://opensource.com/article/20/8/python-android... WebAug 26, 2020 · $ pkg install python Once the installation and auto set-up of configuration is complete, it’s time to build your application. Build an app for Android on Android Now that you have a terminal installed, you can … GitHub - kivy/python-for-android: Turn your Python application … https://github.com/kivy/python-for-android Webpython-for-android is a packaging tool for Python apps on Android. You can create your own Python distribution including the modules and dependencies you want, and bundle it in an APK or AAB along with your … When did Python 2 stop supporting Android? See this and other topics on this result An introduction to Python on Android - Android Authority https://www.androidauthority.com/an-introduction... WebMar 31, 2017 · Python is a particularly simple and elegant coding language that is designed with the beginner in mind. The problem is that learning to … Reviews: 8 Estimated Reading Time: 9 mins Android - Python Wiki https://wiki.python.org/moin/Android WebThere are several ways to use Python on Android. The following table summarizes those projects which are currently active: BeeWare is a toolkit for developing cross-platform … People also ask How to run Python on Android?Create and run Python apps on your Android phone 1 Install Termux on Android. First, install the Termux application. ... 2 Build an app for Android on Android. Now that you have a terminal installed, you can work on your Android phone largely as if it were just another Linux computer. 3 Write Python code on Android. You're all set up. ... Create and run Python apps on your Android phone
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On Monday, 13 March 2023 at 16:16:28 UTC+1, Thomas Passin wrote: > On 3/13/2023 12:39 AM, a a wrote: > > But what I need is analysis of seismograms from 4,000 seismographs world > > wide to detect P-wave energy distribution underground around the earthquake > > to verify EQ Domino Effect > In that case, you will have to do a great deal of work to get all that > data into a common usable form, cleaned and errors removed. That will > be a lot of effort no matter what language you use. In the Matplotlib > lesson you pointed to, the work was already done, for one one earthquake > at one location. > > The reference I gave, > https://towardsdatascience.com/earthquake-time-series-forecasts-using-a-hybr > > id-clustering-lstm-approach-part-i-eda-6797b22aed8c > > actually includes a Python script that does this work for some selected > ranges of data, so it might be a good starting point. Thank you excellent example "The imported json files were heavily-nested; hence, during data cleaning, I “denested” the json files, transformed them into dataframes, fixed the column datatypes, imputed the NaN values, and finally concatenated them into a global dataframe, which was workable. For a full description of data cleaning, visit my GitHub profile. Finally, I indexed the dataframe by timestamps as a time-series dataframe: https://towardsdatascience.com/earthquake-time-series-forecasts-using-a-hybrid-clustering-lstm-approach-part-i-eda-6797b22aed8c I would like to work with Saied Mighani one day but unfortunately, seismology projects, studies are one-man activity. I am success oriented in building Earthquake Prediction System and I am sure, P-wave energy envelope calculate for every earthquake, for every seismographic station can give valuable hints on how earthquake energy is distributed underground, since what is recorded by surface seismographs is some form of such P-wave envelope energy transferred at the direction of surface placed seismograph. Ideas are great but life is for real ;) thank you -- https://mail.python.org/mailman/listinfo/python-list
Re: 转发: How to exit program with custom code and custom message?
On 13Mar2023 10:18, scruel tao wrote:
Chris:
but for anything more complicated, just print and then exit.
It's worth noting, by the way, that sys.exit("error message") will
print that to STDERR, not to STDOUT, which mean that the equivalent
is:
Yes, I know, but don’t you think if `sys.exit` can take more parameters
and have a default output channel selection strategy will be better?
That kind of thing is an open ended can of worms. You're better off
writing your own `aort()` function such as:
def abort(message, *a, output=None, exit_code=1):
if a:
message = message %a
if output is None:
output = sys.stderr
print(message, file=output)
exit(exit_code)
which can be extended with whatever (potentially _many_) custom options
you like. `sys.exit()` itself is just to abort your programme, and
doesn't want a lot of knobs. The more knobs, the more things which have
to be implemented, and if the knobs are not independent that gets
complicated very quickly. Not to mention agreeing on what knobs to
provide.
BTW, `sys.exit()` actually raises a `SystemExit` exception which is
handled by the `sys.excepthook` callback which handles any exception
which escapes from the programme uncaught.
Finally, in larger programs it is uncommon to call `sys.exit()` except
in the very outermost "main function", and even there I tend to just
`return`, myself. Example:
def main(argv=None):
if argv is None:
argv = sys.argv
xit = 0
handle the command line arguments, run code ...
... errors set xit=1 or maybe xit="message" ...
return xit
if __name__ == '__main__':
sys.exit(main(sys.argv))
Notice that the only call to `sys.exit()` is right at the bottom.
Everything else is just regularfunction returns.
Cheers,
Cameron Simpson
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RE: Can you process seismographic signals in Python or should I switch to Matlab ?
Hi, This seems again to be a topic wandering. Was the original question whether Python could be used for dealing with Seismic data of some unspecified sort as in PROCESSING it and now we are debating how to clean various aspects of data and make things like data.frames and extract subsets for analysis? Plenty of the above can be done in any number of places ranging from languages like Python and R to databases and SQL. If the result you want to analyze can then be written in a format with rows and columns containing the usual suspects like numbers and text and dates and so on, then this part of the job can be done anywhere you want. And when you have assembled your data and now want to make a query to generate a subset such as data in a date range that is from a set of measuring stations and with other qualities, then you can simply save the data to a file in whatever format, often something like a .CSV. It is the following steps where you want to choose your language based on what is available. Are you using features like a time series, for example? Are you looking or periodicity. Is graphing a major aspect and do you need some obscure graph types not easily found but that are parts of packages/modules in some language like R or Python? Do you need the analysis to have interactive aspects such as from a GUI, or a web page? Does any aspect of your work include things like statistical analyses or machine learning? The list goes on. As mentioned, people who do lots of stuff along these lines can share some tools in python, or elsewhere, they find useful and that might help fit the needs of the OP but they work best when they have a better idea of what exactly you want to do. Part of what I gleaned, was a want to do a 3-D graph that rotates. Python has multiple graphics packages and so on as do languages like R. The likelihood of finding something useful goes up if you identify if there are communities of people doing similar work and can share some of their tools. Hence the idea of focused searches. Asking here will largely get you people mainly who use Python and if it turns out R or something entirely else meets your needs better, perhaps Mathematica even if you have to pay for it if that is expected by your peers. My guess is that python would be a decent choice as it can do almost anything, but for practical purposes, you do not want to stick with what is in the base and probably want to use extensions like numpy/pandas and perhaps others like scipy and if doing graphics, there are too many including matplotlib and seaborn but you may need something specialized for your needs. I cannot stress the importance of making sure the people evaluating and using your work can handle it. Python is fairly mainstream and free enough that it can foot your bill. But it has various versions and clearly nobody would advise you to use version 2. Some versions are packaged with many of the tools you may want to use, such as Anaconda. It depends on your level of expertise already and how much you want to learn to get this task done. You make it sound like your kind of work must be done alone, and that can simplify things but also mean more work for you. -Original Message- From: Python-list On Behalf Of Thomas Passin Sent: Monday, March 13, 2023 2:10 PM To: python-list@python.org Subject: Re: Can you process seismographic signals in Python or should I switch to Matlab ? On 3/13/2023 11:54 AM, Rich Shepard wrote:> On Mon, 13 Mar 2023, Thomas Passin wrote: > >> No doubt, depending on the data formats used. But it's still going >> to be a big task. > > Thomas, > > True, but once you have a dataframe with all the information about > all the earthquakes you can extract data for every analysis you want > to do. This message would better have gone to the list instead of just me. I'm not saying that Pandas is a bad choice! I'm saying that getting all that data into shape so that it can be ingested into a usable dataframe will be a lot of hard work. > If you've not read Wes McKinney's "Python for Data Analysis: Data > Wrangling with Pandas, NumPy, and IPython" I encourage you to do so. I've been interested in that title, but since I don't currently have any large, complex data wrangling problems I've put it off. -- https://mail.python.org/mailman/listinfo/python-list -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On 3/13/2023 11:54 AM, Rich Shepard wrote:> On Mon, 13 Mar 2023, Thomas Passin wrote: > >> No doubt, depending on the data formats used. But it's still going >> to be a big task. > > Thomas, > > True, but once you have a dataframe with all the information about > all the earthquakes you can extract data for every analysis you want > to do. This message would better have gone to the list instead of just me. I'm not saying that Pandas is a bad choice! I'm saying that getting all that data into shape so that it can be ingested into a usable dataframe will be a lot of hard work. > If you've not read Wes McKinney's "Python for Data Analysis: Data > Wrangling with Pandas, NumPy, and IPython" I encourage you to do so. I've been interested in that title, but since I don't currently have any large, complex data wrangling problems I've put it off. -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On Mon, 13 Mar 2023, Thomas Passin wrote: No doubt, depending on the data formats used. But it's still going to be a big task. Thomas, True, but once you have a dataframe with all the information about all the earthquakes you can extract data for every analysis you want to do. If you've not read Wes McKinney's "Python for Data Analysis: Data Wrangling with Pandas, NumPy, and IPython" I encourage you to do so. Regards, Rich -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On 3/13/2023 11:23 AM, Rich Shepard wrote: On Mon, 13 Mar 2023, Thomas Passin wrote: But what I need is analysis of seismograms from 4,000 seismographs world wide to detect P-wave energy distribution underground around the earthquake to verify EQ Domino Effect In that case, you will have to do a great deal of work to get all that data into a common usable form, cleaned and errors removed. That will be a lot of effort no matter what language you use. In the Matplotlib lesson you pointed to, the work was already done, for one one earthquake at one location. Wouldn't Pandas help here? No doubt, depending on the data formats used. But it's still going to be a big task. -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On Mon, 13 Mar 2023, Thomas Passin wrote: But what I need is analysis of seismograms from 4,000 seismographs world wide to detect P-wave energy distribution underground around the earthquake to verify EQ Domino Effect In that case, you will have to do a great deal of work to get all that data into a common usable form, cleaned and errors removed. That will be a lot of effort no matter what language you use. In the Matplotlib lesson you pointed to, the work was already done, for one one earthquake at one location. Wouldn't Pandas help here? Rich -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On 3/13/2023 12:39 AM, a a wrote: But what I need is analysis of seismograms from 4,000 seismographs world wide to detect P-wave energy distribution underground around the earthquake to verify EQ Domino Effect In that case, you will have to do a great deal of work to get all that data into a common usable form, cleaned and errors removed. That will be a lot of effort no matter what language you use. In the Matplotlib lesson you pointed to, the work was already done, for one one earthquake at one location. The reference I gave, https://towardsdatascience.com/earthquake-time-series-forecasts-using-a-hybr id-clustering-lstm-approach-part-i-eda-6797b22aed8c actually includes a Python script that does this work for some selected ranges of data, so it might be a good starting point. -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On 3/13/2023 12:39 AM, a a wrote: But some unknown reasons Matplotlib and numpy crash my Python 3.8 for Windows , 32-bit and no support is offered It is possible, using pip, to downgrade versions (e.g., of Matplotlob and numpy) to see if you can find versions that work. Of course moving to 64-bit Python >= 3.10 would be better, but if that were possible I imagine you would have done it already. BTW, it would be useful if you said what operating system you are using (I've been assuming Windows). -- https://mail.python.org/mailman/listinfo/python-list
Re: Can you process seismographic signals in Python or should I switch to Matlab ?
On Sunday, 12 March 2023 at 06:17:54 UTC+1, avi.e...@gmail.com wrote: > I have used GNU Octave as a sort of replacement for MATLAB as a free > resource. I have no idea if it might meet your needs. > > Although Python is a good environment for many things, if you have no > knowledge of it yet, it can take a while to know enough and if you just need > it for one project, ... > -Original Message- > From: Python-list On > Behalf Of Thomas Passin > Sent: Sunday, March 12, 2023 12:02 AM > To: pytho...@python.org > Subject: Re: Can you process seismographic signals in Python or should I > switch to Matlab ? > On 3/11/2023 6:54 PM, a a wrote: > > My project > > > https://www.mathworks.com/help/matlab/matlab_prog/loma-prieta-earthquake.htm > l > > If your goal is to step through this Matlab example, then clearly you > should use Matlab. If you do not have access to Matlab or cannot afford > it, then you would have to use something else, and Python would be a > prime candidate. However, each of the techniques and graphs in the > lesson have been pre-packaged for you in the Matlab case but not with > Python (many other case studies on various topics that use Python Python > can be found, though). > > Everything in the Matlab analysis can be done with Python and associated > libraries. You would have to learn various processing and graphing > techniques. You would also have to get the data from somewhere. It's > prepackaged for this analysis and you would have to figure out where to > get it. There is at least one Python package that can read and convert > Matlab files - I do not remember its name, though. > > A more important question is whether doing the Matlab example prepares > you to do any other analyses on your own. To shed some light on this, > here is a post on some rather more advanced analysis using data on the > same earthquake, done with Python tools - > > https://towardsdatascience.com/earthquake-time-series-forecasts-using-a-hybr > id-clustering-lstm-approach-part-i-eda-6797b22aed8c > -- > https://mail.python.org/mailman/listinfo/python-list Thank you my dear friends for your kind opinions. Matlab is pro, commercial, paid and demo is available for tests only. So it's hard to dicuss projects, apps in Matlab if cannot be verified by peers. What is hot today is the following 3D plot animation in Matplotlib https://twitter.com/gmrpetricca/status/1633477532526817281 But some unknown reasons Matplotlib and numpy crash my Python 3.8 for Windows , 32-bit and no support is offered Ok, I can read 100 research papers daily, preview hundreds pages of text from search engines. But what I need is analysis of seismograms from 4,000 seismographs world wide to detect P-wave energy distribution underground around the earthquake to verify EQ Domino Effect As you can see below, the Matlab project named in my first submission turned into Python project and EQ energy envelope makes sense. But I would prefer to join 100+ man project in seismology since it may take me months to download seismograms, process seismograms, preview, select features and build EQ energy envelope 3D plots for earthquakes in Turkey alone. To develop another theory, to get data, process data and get results for analysis to verify EQ energy envelope Domino Effect I am afraid there are no team research projects in seismology. What is published and discussed is one-man project. PICOSS: Python Interface for the Classification of Seismic Signals A. Buenoa, L. Zuccarellob,c, A. D ́ıaz-Morenod, J. Woolamd, M. Titosb, L. Garc ́ıaa, I. ́Alvareza, J. Prudenciob, S. De Angelisd aDepartment of Signal Theory, Telematic and Communications, University of Granada, Spain. bDepartment of Theoretical Physics and Cosmos, University of Granada, Spain. cIstituto Nazionale di Geofisica e Vulcanologia, Sezione di Pisa, Italy dDepartment of Earth, Ocean and Ecological Sciences, University of Liverpool, UK https://core.ac.uk/download/pdf/334413225.pdf seismic-signal https://github.com/topics/seismic-signal STA-LTA Algorithm and Seismometer Trajectory visualization in 3D Tonumoy / STA-LTA-Algorithm-and-Seismometer-Trajectory-visualization-in-3D https://github.com/Tonumoy/STA-LTA-Algorithm-and-Seismometer-Trajectory-visualization-in-3D PICOSS A Python Interface for the Classification of Seismic Signals. PICOSS is a Python GUI designed as a modular data-curator platform for volcano-seismic data analysis. Detection, segmentation and classification. With exportability and standardization at its core, users can select automatic or manual workflows to annotate seismic data from the suite of included tools. Originally, PICOSS was designed for the purposes of seismicity research as a collaboration between University of Granada (UGR) and University of Liverpool (UoL). However, the system can be used within a wide range of geophysical applications. We are currently working on switching
Re: 转发: How to exit program with custom code and custom message?
I totally understand your reasoning here, but in some way it follows the unix
philosophy: Do only one thing, but do that good.
And exiting is something different from printing to STDOUT or STDERR. Yes
sometimes you want to print something before exiting. But then you should do
that explicitly and to the output you want and not implicitly rely on
adfdtitional parameters of exit. Yes, not all functions work this way. But that
does not mean they shouln't ;-)
Cheers
Lars
On 13.03.23 11:18, scruel tao wrote:
Chris:
It doesn't actually take a list of arguments; the square brackets
indicate that arg is optional here.
Oh, I see, it seems that I mistunderstood the document.
but for anything more complicated, just print and then exit.
It's worth noting, by the way, that sys.exit("error message") will
print that to STDERR, not to STDOUT, which mean that the equivalent
is:
Yes, I know, but don’t you think if `sys.exit` can take more parameters and
have a default output channel selection strategy will be better?
Thanks.
Lars Liedtke
Software Entwickler
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转发: How to exit program with custom code and custom message?
Chris:
> It doesn't actually take a list of arguments; the square brackets
indicate that arg is optional here.
Oh, I see, it seems that I mistunderstood the document.
> but for anything more complicated, just print and then exit.
> It's worth noting, by the way, that sys.exit("error message") will
> print that to STDERR, not to STDOUT, which mean that the equivalent
> is:
Yes, I know, but don’t you think if `sys.exit` can take more parameters and
have a default output channel selection strategy will be better?
Thanks.
--
https://mail.python.org/mailman/listinfo/python-list
Re: How to exit program with custom code and custom message?
On Mon, 13 Mar 2023 at 20:00, scruel tao wrote:
>
> Currently, I use `sys.exit([arg])` for exiting program and it works fine.
> As described in the document:
> > If another type of object is passed, None is equivalent to passing zero,
> > and any other object is printed to stderr and results in an exit code of 1.
>
> However, if I want to exit the program with status 0 (or any numbers else
> except 1) and print necessary messages before exiting, I have to write:
> ```python
> print("message")
> sys.exit()
> ```
> So why `sys.exit` takes a list of arguments (`[arg]`) as its parameter?
> Rather than something like `sys.exit(code:int=0, msg:str=None)`?
It doesn't actually take a list of arguments; the square brackets
indicate that arg is optional here. So you can either quickly print
out an error message and exit, or you can exit with any return code
you like, but for anything more complicated, just print and then exit.
It's worth noting, by the way, that sys.exit("error message") will
print that to STDERR, not to STDOUT, which mean that the equivalent
is:
print("error message", file=sys.stderr)
sys.exit(1)
Which is another reason to do things differently on success; if you're
returning 0, you most likely want your output on STDOUT.
ChrisA
--
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How to exit program with custom code and custom message?
Currently, I use `sys.exit([arg])` for exiting program and it works fine.
As described in the document:
> If another type of object is passed, None is equivalent to passing zero, and
> any other object is printed to stderr and results in an exit code of 1.
However, if I want to exit the program with status 0 (or any numbers else
except 1) and print necessary messages before exiting, I have to write:
```python
print("message")
sys.exit()
```
So why `sys.exit` takes a list of arguments (`[arg]`) as its parameter? Rather
than something like `sys.exit(code:int=0, msg:str=None)`?
--
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