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Python 3.12.0 (www.python.org)
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Neato

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Python beginner (feddit.uk)

Good evening, everyone. I have, but one quick inquiry. What are the best resources in your opinion to learn python by yourself as a complete beginner? Thank you all

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submitted 1 week ago* (last edited 1 week ago) by thingsiplay@beehaw.org to c/python@programming.dev

Solved: Thanks to a user with this reply: https://programming.dev/comment/10034690


cross-posted from: https://beehaw.org/post/13901165

Hi all. I have a little problem and don't know how to solve. A CLI program in Python is broken since Python 3.12. It was working in Python 3.11. The reason is, that Python 3.12 changed how subclassing of a pathlib.Path works (basically fixed an issue), which now breaks a workaround.

The class in question is:

class File(PosixPath):
    def __new__(cls, *args: Any, **kwargs: Any) -> Any:
        return cls._from_parts(args).expanduser().resolve()  # type: ignore

    def __init__(self, source: str | Path, *args: Any) -> None:
        super().__init__()
        self.__source = Path(source)

    @property
    def source(self) -> Path:
        return self.__source

    @property
    def modified(self) -> Time:
        return Time.fromtimestamp(os.path.getmtime(self))

    @property
    def changed(self) -> Time:
        return Time.fromtimestamp(os.path.getctime(self))

    @property
    def accessed(self) -> Time:
        return Time.fromtimestamp(os.path.getatime(self))

    # Calculate sha512 hash of self file and compare result to the
    # checksum found in given file. Return True if identical.
    def verify_sha512(self, file: File, buffer_size: int = 4096) -> bool:
        compare_hash: str = file.read_text().split(" ")[0]
        self_hash: str = ""
        self_checksum = hashlib.sha512()
        with open(self.as_posix(), "rb") as f:
            for chunk in iter(lambda: f.read(buffer_size), b""):
                self_checksum.update(chunk)
            self_hash = self_checksum.hexdigest()
        return self_hash == compare_hash

and I get this error when running the script:

Traceback (most recent call last):
File "/home/tuncay/.local/bin/geprotondl", line 1415, in 
sys.exit(main())
^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 1334, in main
arguments, status = parse_arguments(argv)
^^^^^^^^^^^^^^^^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 1131, in parse_arguments
default, status = default_install_dir()
^^^^^^^^^^^^^^^^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 1101, in default_install_dir
steam_root: File = File(path)
^^^^^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 97, in __new__
return cls._from_parts(args).expanduser().resolve()  # type: ignore
^^^^^^^^^^^^^^^
AttributeError: type object 'File' has no attribute '_from_parts'. Did you mean: '_load_parts'?

Now replacing _from_parts with _load_parts does not work either and I get this message in that case:

Traceback (most recent call last):
File "/home/tuncay/.local/bin/geprotondl", line 1415, in 
sys.exit(main())
^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 1334, in main
arguments, status = parse_arguments(argv)
^^^^^^^^^^^^^^^^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 1131, in parse_arguments
default, status = default_install_dir()
^^^^^^^^^^^^^^^^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 1101, in default_install_dir
steam_root: File = File(path)
^^^^^^^^^^
File "/home/tuncay/.local/bin/geprotondl", line 97, in __new__
return cls._load_parts(args).expanduser().resolve()  # type: ignore
^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3.12/pathlib.py", line 408, in _load_parts
paths = self._raw_paths
^^^^^^^^^^^^^^^
AttributeError: 'tuple' object has no attribute '_raw_paths'

I have searched the web and don't understand how to fix this. Has anyone an idea what to do?

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Trey Hunner writes:

This article is primarily meant to act as a Python time complexity cheat sheet for those who already understand what time complexity is and how the time complexity of an operation might affect your code. For a more thorough explanation of time complexity see Ned Batchelder's article/talk on this subject.

Read Python Big O: the time complexities of different data structures in Python

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I have a Keybow MINI hooked up to a Raspberry Pi Zero W, and I'm using Python to respond to events. I have one button that kicks off playing a song on a passive buzzer, and I'm wondering if there's a way to have a button press stop the song before it completes.

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Many commertial apps have options to run apps at logins... Is there any cross-platform way to do so in python?

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Would love to hear any suggestions, feedback or comments.

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submitted 1 month ago by mao@lemmy.sdf.org to c/python@programming.dev

Twitter user @DanyX23:

TIL: pyright, the python type checking engine that is used by VS Code, has support for exhaustiveness checking for match statements with union types!

If you add the following to your pyproject.toml, you'll get the attached warning

[tool.pyright] reportMatchNotExhaustive = true

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submitted 1 month ago* (last edited 1 month ago) by yo_scottie_oh@lemmy.ml to c/python@programming.dev

Not sure if this is allowed here, and it's not my playlist, but I thought I'd post these tutorials since I've found them helpful for learning the basics.

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submitted 1 month ago* (last edited 1 month ago) by yo_scottie_oh@lemmy.ml to c/python@programming.dev

Hello! I'm attempting to follow some tutorials on unit testing with Python. One of them is a video tutorial Unit Tests in Python on the Socratica channel. Everyone in the comments seems to be making out just fine, and I’m following the instructor’s directions to the letter, yet I get a different result. It’s driving me mad lol.

In the video, the instructor creates two text files, one called circles.py in which she defines a function circle_area(r), and another called test_circles.py in which she writes some unit tests. In my attempt to follow along, I've ended up with two files structured like so:

/home/yo_scottie_oh/Projects/PythonTutorials/Socratica/Circles
├── circles.py
└── test_circles.py

circles.py:

from math import pi

def circle_area(r):
   return pi*(r**2)

# Test function
radii = [2, 0, -3, 2 + 5j, True, "radius"]
message = "Area of circles with r = {radius} is {area}."

for r in radii:
   A = circle_area(r)
   print(message.format(radius=r,area=A))

test_circles.py:

import unittest
from circles import circle_area
from math import pi

class TestCircleArea(unittest.TestCase):
   def test_area(self):
      # Test areas when radius >=0
      self.assertAlmostEqual(circle_area(1),pi)
      self.assertAlmostEqual(circle_area(0),0)
      self.assertAlmostEqual(circle_area(2.1),pi*2.1**2)

Where I'm getting tripped up is at 4:32 in the video, the instructor says to run the unit tests by opening a shell, going to the directory that contains both the circles and test_circles modules, and issuing the following command: python -m unittest test_circles.

Instructor's result (it runs the unit test):

Ran 1 test in 0.000s

OK

My result (it seems to execute circles.py itself):

[yo_scottie_oh@nobara Circles]$ python -m unittest test_circles
Area of circles with r = 2 is 12.566370614359172.
Area of circles with r = 0 is 0.0.
Area of circles with r = -3 is 28.274333882308138.
Area of circles with r = (2+5j) is (-65.97344572538566+62.83185307179586j).
Area of circles with r = True is 3.141592653589793.
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/usr/lib64/python3.11/unittest/__main__.py", line 18, in <module>
    main(module=None)
  File "/usr/lib64/python3.11/unittest/main.py", line 101, in __init__
    self.parseArgs(argv)
  File "/usr/lib64/python3.11/unittest/main.py", line 150, in parseArgs
    self.createTests()
  File "/usr/lib64/python3.11/unittest/main.py", line 161, in createTests
    self.test = self.testLoader.loadTestsFromNames(self.testNames,
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 232, in loadTestsFromNames
    suites = [self.loadTestsFromName(name, module) for name in names]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 232, in <listcomp>
    suites = [self.loadTestsFromName(name, module) for name in names]
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 162, in loadTestsFromName
    module = __import__(module_name)
             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/yo_scottie_oh/Projects/PythonTutorials/Socratica/Circles/test_circles.py", line 4, in <module>
    from circles import circle_area
  File "/home/yo_scottie_oh/Projects/PythonTutorials/Socratica/Circles/circles.py", line 14, in <module>
    A = circle_area(r)
        ^^^^^^^^^^^^^^
  File "/home/yo_scottie_oh/Projects/PythonTutorials/Socratica/Circles/circles.py", line 6, in circle_area
    return pi*(r**2)
               ~^^~
TypeError: unsupported operand type(s) for ** or pow(): 'str' and 'int'
[yo_scottie_oh@nobara Circles]$

I've been banging my head against the wall for hours now trying to figure out why when I execute the same command as the instructor, it appears to execute my Python scripts themselves instead of running the unit tests.

Other things I've tried:

I've read the Python documentation on unit testing. I tried adding this to the end of the test_circles.py document, but that did not change anything.

if __name__ == '__main__':
    unittest.main()

I've tried following this other written tutorial. After I create the text documents and organize them in the separate shapes and tests folders and run the command python -m unittest discover -v, again I get a different result from the author.

Author's result:

test_area (test_circle.TestCircle) ... ok
test_circle_instance_of_shape (test_circle.TestCircle) ... ok
test_create_circle_negative_radius (test_circle.TestCircle) ... ok
test_area (test_square.TestSquare) ... ok
test_create_square_negative_length (test_square.TestSquare) ... ok
test_square_instance_of_shape (test_square.TestSquare) ... ok

----------------------------------------------------------------------
Ran 6 tests in 0.002s

OK

My result:

[yo_scottie_oh@nobara test]$ python -m unittest discover -v
test_circle (unittest.loader._FailedTest.test_circle) ... ERROR
test_square (unittest.loader._FailedTest.test_square) ... ERROR

======================================================================
ERROR: test_circle (unittest.loader._FailedTest.test_circle)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_circle
Traceback (most recent call last):
  File "/usr/lib64/python3.11/unittest/loader.py", line 419, in _find_test_path
    module = self._get_module_from_name(name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 362, in _get_module_from_name
    __import__(name)
  File "/home/yo_scottie_oh/Projects/PythonTutorials/PythonUnitTesting/test/test_circle.py", line 4, in <module>
    from shapes.circle import Circle
ModuleNotFoundError: No module named 'shapes'


======================================================================
ERROR: test_square (unittest.loader._FailedTest.test_square)
----------------------------------------------------------------------
ImportError: Failed to import test module: test_square
Traceback (most recent call last):
  File "/usr/lib64/python3.11/unittest/loader.py", line 419, in _find_test_path
    module = self._get_module_from_name(name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/unittest/loader.py", line 362, in _get_module_from_name
    __import__(name)
  File "/home/yo_scottie_oh/Projects/PythonTutorials/PythonUnitTesting/test/test_square.py", line 3, in <module>
    from shapes.square import Square
ModuleNotFoundError: No module named 'shapes'


----------------------------------------------------------------------
Ran 2 tests in 0.000s

FAILED (errors=2)

So yeah… this brings me to my question: What’s the obvious thing that everybody else gets that I'm missing? Is the tutorial outdated? Is it because the instructor is on Windows and I’m on Linux? Why won’t my unit tests run?

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Siddharta Govindaraj writes:

As I blogged about in the previous two articles, I recently updated my NeoVim configuration for the fourth time. Although it might sound like a lot of config updates, keep in mind that it happened over a period of four years.

  • The first version was a port of my existing Vim configuration. Because NeoVim is backward compatible with Vim, you can just move the configuration over and it will work
  • In the second version, I migrated my plugin manager to Packer. This config was a mix of old style Vim config and the newer NeoVim style with some plugins migrated to Lua equivalents
  • Then I decided to go 100% Lua config and started using Kickstart.nvim and LazyVim.
  • This fourth time around I used Kickstart and LazyVim as guides to write my own from scratch.

You can find my NeoVim configuration on Github.

In this article I am going to go through and explain my configuration step-by-step. I have a terrible memory, so this post will also serve as a guide when I inevitably need to look through this file in the future.

Read Configuring NeoVim as a Python IDE (2023)

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submitted 1 month ago by ylai@lemmy.ml to c/python@programming.dev
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submitted 1 month ago by ylai@lemmy.ml to c/python@programming.dev
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cross-posted from: https://programming.dev/post/12688262

Hello!

This is my little Zsh frontend for Python venv and dependency management, as well as pipx-like app installation.

It's not new, but I just made a new release that can use uv as a backend, making it much faster (and hipper, obviously).

If you have zpy installed, you can install uv with the pipz command, and from then on zpy will use uv instead of Python's venv module and pip-tools:

% pipz install uv

If you have any questions, please ask!

I personally use it in combination with mise (for Python runtime management) and flit (for package publishing), but aim to keep it rather agnostic and interoperable.

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Hi there 👋, I’m Gerard, founder of Latitude.

I have written an article on how I approached building an open-source data tool. I had doubts about Python vs JavaScript, but I’m happy with the path I chose.

Would love it if you guys give me any feedback!

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Python 3.11.9 is now available (pythoninsider.blogspot.com)
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tl;dr – Apache Software Foundation, Blender Foundation, OpenSSL Software Foundation, PHP Foundation, Rust Foundation, and Eclipse Foundation have jointly announced their intention to collaborate on the establishment of common specifications for secure software development based on existing open source best practices. https://eclipse-foundation.blog/2024/04/02/open-source-community-cra-compliance/ #opensource #cra #cybersecurity @python @rust @EclipseFdn @opensslannounce @Blender

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Using Tkinter and Some Ninja CLI Skillz

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