🌐 Mailman 3 August 2024 - Tutor - python.org

Dataclass question
by Albert-Jan Roskam Aug. 23, 2024

Aug. 23, 2024

Hi, I'm using dataclasses and one of the fields is has a bytes type. It could be the contents of a .zip or .csv. I don't want to see so much clutter in the logs or on the screen, so I'm looking for a neat way to omit most of the info from the dataclass object's representation. Using the code below, field "y" is not shown at all, which is not really what I want (but it's nice and clean). Field "z" is more like it, but it requires more code. Is there a better way? Maybe with pydantic? from dataclasses import field, dataclass class AbbreviatedBytes(bytes): def __repr__(self, width=2): r = super().__repr__() return r if len(self) < width else f"{r[:width + 1]} [...]'" @dataclass class Test: x : bytes = b"" y : bytes = field(default=b"", repr=False) z : bytes = b"" def __post_init__(self): self.z = AbbreviatedBytes(self.z) print(Test(b"aaaa", b"bbbb", b"cccc")) # output: Test(x=b'aaaa', z=b'c [...]') Best wishes, Albert-Jan

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Any Jupyter users?
by Alan Gauld Aug. 18, 2024

Aug. 18, 2024

I have a friend doing a CS degree and running into problems with a Python "program" in her data science course. I said I'd take a look although data analysis is not my forte. When I got there I was presented with a Jupyter/Anaconda environment and the program seemed to be effectively a long interactive session (which Jupyter can save and rerun) about 200+ lines. Most of which is simply calling into library functions from the anaconda stack plus a half dozen libraries installed by pip at the top of the session. The error (a valueError) when I got to it is raised deep inside one of the imported libraries and the traceback does not go all the way to the top (only 3 or 4 levels) so it's not clear where the student's code is calling the library (although I suspect it will be the line in Jupyter above the error trace... But that is not calling any of the functions listed in the traceback. I don't use Anaconda or Jupyter so I'm not sure what debugging facilities are available. Is there a way to generate a complete traceback? Are there ways to find out where a function is defined (which module?). I did a simple text search but it didn't find the highest function listed so I assume it's inside a module somewhere, but where? Are there any tracing facilities like the ability to step through/into a function? Also can you save a Jupyter session as a runnable python file (ie with all the output stuff removed or commented out)? That way we might get a more complete error trace from the vanilla interpreter. Or load it into a smart IDE like Visual Code that can jump up and down the stack. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos

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Question
by Markis Gardner Aug. 13, 2024

Aug. 13, 2024

This is my first time - so I hope I am doing this correctly. A long time ago, back when VB 6 was still popular (boy I loved that language, but hated what they did to it in VB.NET. WIshed they still had it) and Yahoo messenger was still around. I wrote a SUPER SIMPLE ABBREVIATED form of messenger able to chat with other people. Is it possible to do it as a standalone program with Python? If yes, can you give me suggestions on what to read (please don't send me the code solution)? If no, what is the best that can be done with JUST python? Thank you! Markis -- I am a certified Education consultant with *both *PIER and ICEF. http://connect.pierapps.com/widgets/agencies/42472 Check out one of my inventions.. Laser Deflector! Laser Deflector (lasermirrorgame.com) <https://lasermirrorgame.com/>

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