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

<p><strong>Watch the live stream:</strong></p> <a href='https://www.youtube.com/watch?v=U6KDaVWw0ko' style='font-weight: bold;'>Watch on YouTube</a><br> <br> <p><strong>About the show</strong></p> <p>Sponsored by us! Support our work through:</p> <ul> <li>Our <a href="https://training.talkpython.fm/"><strong>courses at Talk Python Training</strong></a></li> <li><a href="https://testandcode.com/"><strong>Test &amp; Code</strong></a> Podcast</li> <li><a href="https://www.patreon.com/pythonbytes"><strong>Patreon Supporters</strong></a></li> </ul> <p><strong>Michael #1:</strong> <a href="https://wagenrace.github.io/python_dep_frontend/"><strong>Python License tracker</strong></a></p> <ul> <li>by Tom Nijhof/Nyhof</li> <li>Every package depends on other package with sometimes different licenses.</li> <li>Tom made a tool to find out what licenses you all need for a project:</li> <li>PyTest alone needs 4 different licenses for itself and its dependencies.</li> <li>Tensorflow is even worst</li> </ul> <p><strong>Brian #2:</strong> <a href="https://www.pythonmorsels.com/undataclass/"><strong>undataclass</strong></a></p> <ul> <li>Trey Hunner</li> <li>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.</li> <li><p>Example in app:</p> <pre><code>from dataclasses import dataclass @dataclass() class Point: x: float y: float z: float </code></pre></li> <li><p>Converts to</p> <pre><code>class Point: __match_args__ = ('x', 'y', 'z') def __init__(self, x: float, y: float, z: float) -&gt; 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) </code></pre></li> <li><p>Note on <code>NotImplemented</code>:</p> <ul> <li>It just means, “I don’t know how to compare this”, and Python will try <code>__eq__</code> on the <code>other</code> object. If that also raises <code>NotImplemented</code>, a <code>False</code> is returned. </li> </ul></li> <li>The default is the above with <code>@dataclass(frozen=True, slots=True)</code> and adds the methods: <ul> <li><code>fronzen=True</code> gives you implementations of <code>__hash__</code>, <code>__setattr__</code>, <code>__delattr__</code>, <code>__getstate__</code>, <code>__setstate__</code>, <ul> <li>Essentially raises exception if you try to change the contents, and makes your objects hashable. </li> </ul></li> <li><code>slots=True</code> adds the line: <code>__slots__ = (``'``x',</code> <code>'``y``'``,</code> <code>'``z``'``)</code>. <ul> <li>This disallows adding new attributes to objects at runtime. See <a href="https://docs.python.org/3.10/reference/datamodel.html#slots">Python docs</a></li> </ul></li> </ul></li> <li>Trey wrote two posts about it: <ul> <li><a href="https://www.pythonmorsels.com/match-case-parsing-python/">Appreciating Python's match-case by parsing Python code</a></li> <li><a href="https://www.pythonmorsels.com/making-a-dataclass-remover/">How I made a dataclass remover</a></li> </ul></li> <li>Turns out, this is a cool example for AST and structural pattern matching.</li> <li>Notes from the “how I made..” article:</li> <li>"I used some tricks I don't usually get to use in Python. I used:</li> <li>Many <strong>very hairy</strong> <code>**match**</code><strong>-</strong><code>**case**</code> <strong>blocks</strong> which replaced even hairier <code>if</code>-<code>elif</code> blocks</li> <li>A <strong>sentinel object</strong> to keep track of a location that needed replacing</li> <li>Python's <code>**textwrap.dedent**</code> <strong>utility</strong>, which I feel should be more widely known &amp; used</li> <li><strong>slice assignment</strong> to inject one list into another</li> <li>The <code>ast</code> module's <code>unparse</code> function to convert an abstract syntax tree into Python code”</li> </ul> <p><strong>Michael #3:</strong> <a href="https://qutebrowser.org"><strong>Qutebrowser</strong></a></p> <ul> <li>via Martin Borus</li> <li>Qutebrowser is a keyboard-focused browser with a minimal GUI."</li> <li>It's Python powered </li> <li>Whats more important - doesn't force you to use it's Vim-based shortcuts, the mouse</li> <li>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.</li> </ul> <p><strong>Brian #4:</strong> <strong>asyncio and web applications</strong></p> <ul> <li>A collection of articles</li> <li><a href="https://palletsprojects.com/blog/quart-pallets/">Quart is now a Pallets project</a> <ul> <li>P G Jones, maintainer of Quart and Hypercorn</li> <li>“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.</li> <li>Our long term aim is to merge Quart and Flask to bring ASGI support directly to Flask. </li> <li>“When to use Quart?” <ul> <li>“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.”</li> </ul></li> </ul></li> <li><a href="https://flask.palletsprojects.com/en/2.1.x/async-await/">Using async and await</a>, from Flask docs <ul> <li>Flask has some support of async/await since Flask 2.0</li> <li>But it’s still a WSGI application.</li> <li>“Deciding whether you should use Flask, Quart, or something else is ultimately up to understanding the specific needs of your project.”</li> </ul></li> <li><a href="https://www.laac.dev/blog/should-you-use-asyncio-next-python-web-application/">Should You Use AsyncIO for Your Next Python Web Application?</a> <ul> <li>Steven Pate</li> <li>A cool “brief history of Python web server interfaces”</li> <li>Discussion of the Python servers and frameworks for both WSGI and ASGI</li> <li>Recommendation: Do you need async? “… most people don’t. WSGI servers and frameworks are usually performant enough.”</li> </ul></li> </ul> <p><strong>Extras</strong> </p> <p>Michael:</p> <ul> <li>Python Web Conf Talk: <a href="https://www.youtube.com/watch?v=-qU3cfU35OE"><strong>HTMX + Flask: Modern Python Web Apps, Hold the JavaScript</strong></a></li> <li><a href="https://github.com/will-stone/browserosaurus">browserosaurus</a></li> </ul> <p><strong>Joke:</strong> <a href="https://twitter.com/PR0GRAMMERHUM0R/status/1542855590753583104"><strong>Understanding JavaScript</strong></a></p> <p><strong>Joke:</strong> <a href="https://www.neta.mk/archive"><strong>Where do you see yourself in 5 years?</strong></a></p> <p><img src="https://paper-attachments.dropbox.com/s_2B2DA5ABAB520A067C7A455F46C098AF9EB6B5C867D3A5122B548BFAFDACC225_1657115556852_image.png" alt="" /></p>