#291: Wait, you have how many licenses?!?

Play on YouTube

Watch the live stream replay

About the show

Sponsored by us! Support our work through:

• Our courses at Talk Python Training
• Test & Code Podcast
• Patreon Supporters

Michael #1: Python License tracker

• by Tom Nijhof/Nyhof
• Every package depends on other package with sometimes different licenses.
• Tom made a tool to find out what licenses you all need for a project:
• PyTest alone needs 4 different licenses for itself and its dependencies.
• Tensorflow is even worst

Brian #2: undataclass

• Trey Hunner
• As a teaching aid, and to show how much dataclasses do for you, this is a module and an application that converts dataclasses to normal classes, and fills in all of the dunder methods you need.

• Example in app:

  from dataclasses import dataclass
  
      @dataclass()
      class Point:
          x: float
          y: float
          z: float
  

• Converts to

  class Point:
          __match_args__ = ('x', 'y', 'z')
  
          def __init__(self, x: float, y: float, z: float) -> None:
              self.x = x
              self.y = y
              self.z = z
  
          def __repr__(self):
              cls = type(self).__name__
              return f'{cls}(x={self.x!r}, y={self.y!r}, z={self.z!r})'
  
          def __eq__(self, other):
              if not isinstance(other, Point):
                  return NotImplemented
              return (self.x, self.y, self.z) == (other.x, other.y, other.z)
  

• Note on NotImplemented:

  • It just means, “I don’t know how to compare this”, and Python will try __eq__ on the other object. If that also raises NotImplemented, a False is returned.
• The default is the above with @dataclass(frozen=True, slots=True) and adds the methods:
  • fronzen=True gives you implementations of __hash__, __setattr__, __delattr__, __getstate__, __setstate__,
    • Essentially raises exception if you try to change the contents, and makes your objects hashable.
  • slots=True adds the line: __slots__ = (``'``x', '``y``'``, '``z``'``).
    • This disallows adding new attributes to objects at runtime. See Python docs
• Trey wrote two posts about it:
  • Appreciating Python's match-case by parsing Python code
  • How I made a dataclass remover
• Turns out, this is a cool example for AST and structural pattern matching.
• Notes from the “how I made..” article:
• "I used some tricks I don't usually get to use in Python. I used:

1. Many very hairy **match**-**case** blocks which replaced even hairier if-elif blocks
2. A sentinel object to keep track of a location that needed replacing
3. Python's **textwrap.dedent** utility, which I feel should be more widely known & used
4. slice assignment to inject one list into another
5. The ast module's unparse function to convert an abstract syntax tree into Python code”

Michael #3: Qutebrowser

• via Martin Borus
• Qutebrowser is a keyboard-focused browser with a minimal GUI."
• It's Python powered
• Whats more important - doesn't force you to use it's Vim-based shortcuts, the mouse
• still works. But you usually don't need it: Because on any page, a keypress on the "f" key will show, you every clickable think and a letter combination to enter to click this.

Brian #4: asyncio and web applications

• A collection of articles
• Quart is now a Pallets project
  • P G Jones, maintainer of Quart and Hypercorn
  • “Quart, an ASGI re-implementation of the Flask API has joined the Pallets organization. This means that future development will be under the Pallets governance by the Pallets maintainers.
  • Our long term aim is to merge Quart and Flask to bring ASGI support directly to Flask.
  • “When to use Quart?”
    • “Quart is an ASGI framework utilising async IO throughout, whereas Flask is a WSGI framework utilising sync IO. It is therefore best to use Quart if you intend to use async IO (i.e. async/await libraries) and Flask if not. Don't worry if you choose the 'wrong' framework though, as Quart supports sync IO and Flask supports async IO, although less efficiently.”
• Using async and await, from Flask docs
  • Flask has some support of async/await since Flask 2.0
  • But it’s still a WSGI application.
  • “Deciding whether you should use Flask, Quart, or something else is ultimately up to understanding the specific needs of your project.”
• Should You Use AsyncIO for Your Next Python Web Application?
  • Steven Pate
  • A cool “brief history of Python web server interfaces”
  • Discussion of the Python servers and frameworks for both WSGI and ASGI
  • Recommendation: Do you need async? “… most people don’t. WSGI servers and frameworks are usually performant enough.”

Extras

Michael:

• Python Web Conf Talk: HTMX + Flask: Modern Python Web Apps, Hold the JavaScript
• browserosaurus

Joke: Understanding JavaScript

Joke: Where do you see yourself in 5 years?