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Real Python: What's Lazy Evaluation in Python?

Planet Python - Wed, 2024-04-24 10:00

Being lazy is not always a bad thing. Every line of code you write has at least one expression that Python needs to evaluate. Python lazy evaluation is when Python takes the lazy option and delays working out the value returned by an expression until that value is needed.

An expression in Python is a unit of code that evaluates to a value. Examples of expressions include object names, function calls, expressions with arithmetic operators, literals that create built-in object types such as lists, and more. However, not all statements are expressions. For example, if statements and for loop statements don’t return a value.

Python needs to evaluate every expression it encounters to use its value. In this tutorial, you’ll learn about the different ways Python evaluates these expressions. You’ll understand why some expressions are evaluated immediately, while others are evaluated later in the program’s execution. So, what’s lazy evaluation in Python?

Get Your Code: Click here to download the free sample code that shows you how to use lazy evaluation in Python.

Take the Quiz: Test your knowledge with our interactive “What's Lazy Evaluation in Python?” quiz. You’ll receive a score upon completion to help you track your learning progress:

Interactive Quiz

What's Lazy Evaluation in Python?

In this quiz, you'll test your understanding of the differences between lazy and eager evaluation in Python. By working through this quiz, you'll revisit how Python optimizes memory use and computational overhead by deciding when to compute values.

In Short: Python Lazy Evaluation Generates Objects Only When Needed

An expression evaluates to a value. However, you can separate the type of evaluation of expressions into two types:

  1. Eager evaluation
  2. Lazy evaluation

Eager evaluation refers to those cases when Python evaluates an expression as soon as it encounters it. Here are some examples of expressions that are evaluated eagerly:

Python 1>>> 5 + 10 215 3 4>>> import random 5>>> random.randint(1, 10) 64 7 8>>> [2, 4, 6, 8, 10] 9[2, 4, 6, 8, 10] 10>>> numbers = [2, 4, 6, 8, 10] 11>>> numbers 12[2, 4, 6, 8, 10] Copied!

Interactive environments, such as the standard Python REPL used in this example, display the value of an expression when the line only contains the expression. This code section shows a few examples of statements and expressions:

  • Lines 1 and 2: The first example includes the addition operator +, which Python evaluates as soon as it encounters it. The REPL shows the value 15.
  • Lines 4 to 6: The second example includes two lines:
    • The import statement includes the keyword import followed by the name of a module. The module name random is evaluated eagerly.
    • The function call random.randint() is evaluated eagerly, and its value is returned immediately. All standard functions are evaluated eagerly. You’ll learn about generator functions later, which behave differently.
  • Lines 8 to 12: The final example has three lines of code:
    • The literal to create a list is an expression that’s evaluated eagerly. This expression contains several integer literals, which are themselves expressions evaluated immediately.
    • The assignment statement assigns the object created by the list literal to the name numbers. This statement is not an expression and doesn’t return a value. However, it includes the list literal on the right-hand side, which is an expression that’s evaluated eagerly.
    • The final line contains the name numbers, which is eagerly evaluated to return the list object.

The list you create in the final example is created in full when you define it. Python needs to allocate memory for the list and all its elements. This memory won’t be freed as long as this list exists in your program. The memory allocation in this example is small and won’t impact the program. However, larger objects require more memory, which can cause performance issues.

Lazy evaluation refers to cases when Python doesn’t work out the values of an expression immediately. Instead, the values are returned at the point when they’re required in the program. Lazy evaluation can also be referred to as call-by-need.

This delay of when the program evaluates an expression delays the use of resources to create the value, which can improve the performance of a program by spreading the time-consuming process across a longer time period. It also prevents values that will not be used in the program from being generated. This can occur when the program terminates or moves to another part of its execution before all the generated values are used.

When large datasets are created using lazily-evaluated expressions, the program doesn’t need to use memory to store the data structure’s contents. The values are only generated when they’re needed.

An example of lazy evaluation occurs within the for loop when you iterate using range():

Python for index in range(1, 1_000_001): print(f"This is iteration {index}") Copied!

The built-in range() is the constructor for Python’s range object. The range object does not store all of the one million integers it represents. Instead, the for loop creates a range_iterator from the range object, which generates the next number in the sequence when it’s needed. Therefore, the program never needs to have all the values stored in memory at the same time.

Lazy evaluation also allows you to create infinite data structures, such as a live stream of audio or video data that continuously updates with new information, since the program doesn’t need to store all the values in memory at the same time. Infinite data structures are not possible with eager evaluation since they can’t be stored in memory.

There are disadvantages to deferred evaluation. Any errors raised by an expression are also deferred to a later point in the program. This delay can make debugging harder.

The lazy evaluation of the integers represented by range() in a for loop is one example of lazy evaluation. You’ll learn about more examples in the following section of this tutorial.

What Are Examples of Lazy Evaluation in Python?

In the previous section, you learned about using range() in a for loop, which leads to lazy evaluation of the integers represented by the range object. There are other expressions in Python that lead to lazy evaluation. In this section, you’ll explore the main ones.

Other Built-In Data Types Read the full article at https://realpython.com/python-lazy-evaluation/ »

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Categories: FLOSS Project Planets

Tag1 Consulting: Source Site Audit - A High Level Overview

Planet Drupal - Wed, 2024-04-24 09:00

One of the most impactful things to do in preparation for any migration project is to understand the source site. The more insight you gather into how the current site was built, the better equipped you will be to perform the migration.

Read more mauricio Wed, 04/24/2024 - 06:00
Categories: FLOSS Project Planets

Programiz: Getting Started with Python

Planet Python - Wed, 2024-04-24 06:44
In this tutorial, you will learn to write your first Python program.
Categories: FLOSS Project Planets

Russell Coker: Source Code With Emoji

Planet Debian - Wed, 2024-04-24 04:03

The XKCD comic Code Quality [1] inspired me to test out emoji in source. I really should have done this years ago when that XKCD was first published.

The following code compiles in gcc and runs in the way that anyone who wants to write such code would want it to run. The hover text in the XKCD comic is correct. You could have a style guide for such programming, store error messages in the doctor and nurse emoji for example.

#include <stdio.h> int main() {   int 😇 = 1, 😈 = 2;   printf("😇=%d, 😈=%d\n", 😇, 😈);   return 0; }

To get this to display correctly in Debian you need to install the fonts-noto-color-emoji package (used by the KDE emoji picker that runs when you press Windows-. among other things) and restart programs that use emoji. The Konsole terminal emulator will probably need it’s profile settings changed to work with this if you ran Konsole before installing fonts-noto-color-emoji. The Kitty terminal emulator works if you restart it after installing fonts-noto-color-emoji.

This web page gives a list of HTML codes for emoji [2]. If I start writing real code with emoji variable names then I’ll have to update my source to HTML conversion script (which handles <>" and repeated spaces) to convert emoji.

I spent a couple of hours on this and I think it’s worth it. I have filed several Debian bug reports about improvements needed to issues related to emoji.

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Categories: FLOSS Project Planets

Talking Drupal: Skills Upgrade #8

Planet Drupal - Wed, 2024-04-24 04:00

Welcome back to “Skills Upgrade” a Talking Drupal mini-series following the journey of a D7 developer learning D10. This is episode 8.

Topics Resources

Chad's Drupal 10 Learning Curriclum & Journal Chad's Drupal 10 Learning Notes

The Linux Foundation is offering a discount of 30% off e-learning courses, certifications and bundles with the code, all uppercase DRUPAL24 and that is good until June 5th https://training.linuxfoundation.org/certification-catalog/

Hosts

AmyJune Hineline - @volkswagenchick

Guests

Chad Hester - chadkhester.com @chadkhest Mike Anello - DrupalEasy.com @ultimike

Categories: FLOSS Project Planets

Talk Python to Me: #458: Serverless Python in 2024

Planet Python - Wed, 2024-04-24 04:00
What is the state of serverless computing and Python in 2024? What are some of the new tools and best practices? We are lucky to have Tony Sherman who has a lot of practical experience with serverless programming on the show.<br/> <br/> <strong>Episode sponsors</strong><br/> <br/> <a href='https://talkpython.fm/sentry'>Sentry Error Monitoring, Code TALKPYTHON</a><br> <a href='https://talkpython.fm/mailtrap'>Mailtrap</a><br> <a href='https://talkpython.fm/training'>Talk Python Courses</a><br/> <br/> <strong>Links from the show</strong><br/> <br/> <div><b>Tony Sherman on Twitter</b>: <a href="https://twitter.com/tsh3rman" target="_blank" rel="noopener">twitter.com</a><br/> <b>Tony Sherman</b>: <a href="https://www.linkedin.com/in/tony--sherman/" target="_blank" rel="noopener">linkedin.com</a><br/> <b>PyCon serverless talk</b>: <a href="https://www.youtube.com/watch/2SZ6Wks5iK4" target="_blank" rel="noopener">youtube.com</a><br/> <b>AWS re:Invent talk</b>: <a href="https://www.youtube.com/watch?v=52W3Qyg242Y" target="_blank" rel="noopener">youtube.com</a><br/> <b>Powertools for AWS Lambda</b>: <a href="https://docs.powertools.aws.dev/lambda/python/latest/" target="_blank" rel="noopener">docs.powertools.aws.dev</a><br/> <b>Pantsbuild: The ergonomic build system</b>: <a href="https://www.pantsbuild.org/" target="_blank" rel="noopener">pantsbuild.org</a><br/> <b>aws-lambda-power-tuning</b>: <a href="https://github.com/alexcasalboni/aws-lambda-power-tuning" target="_blank" rel="noopener">github.com</a><br/> <b>import-profiler</b>: <a href="https://github.com/cournape/import-profiler" target="_blank" rel="noopener">github.com</a><br/> <b>AWS Fargate</b>: <a href="https://aws.amazon.com/fargate/" target="_blank" rel="noopener">aws.amazon.com</a><br/> <b>Run functions on demand. Scale automatically.</b>: <a href="https://www.digitalocean.com/products/functions" target="_blank" rel="noopener">digitalocean.com</a><br/> <b>Vercel</b>: <a href="https://vercel.com/docs/functions/serverless-functions/runtimes/python" target="_blank" rel="noopener">vercel.com</a><br/> <b>Deft</b>: <a href="https://deft.com" target="_blank" rel="noopener">deft.com</a><br/> <b>37 Signals We stand to save $7m over five years from our cloud exit</b>: <a href="https://world.hey.com/dhh/we-stand-to-save-7m-over-five-years-from-our-cloud-exit-53996caa" target="_blank" rel="noopener">world.hey.com</a><br/> <b>The Global Content Delivery Platform That Truly Hops</b>: <a href="https://bunny.net" target="_blank" rel="noopener">bunny.net</a><br/> <b>Watch this episode on YouTube</b>: <a href="https://www.youtube.com/watch?v=A5bbUq-ZJh0" target="_blank" rel="noopener">youtube.com</a><br/> <br/> <b>--- Stay in touch with us ---</b><br/> <b>Subscribe to us on YouTube</b>: <a href="https://talkpython.fm/youtube" target="_blank" rel="noopener">youtube.com</a><br/> <b>Follow Talk Python on Mastodon</b>: <a href="https://fosstodon.org/web/@talkpython" target="_blank" rel="noopener"><i class="fa-brands fa-mastodon"></i>talkpython</a><br/> <b>Follow Michael on Mastodon</b>: <a href="https://fosstodon.org/web/@mkennedy" target="_blank" rel="noopener"><i class="fa-brands fa-mastodon"></i>mkennedy</a><br/></div>
Categories: FLOSS Project Planets

Russell Coker: Ubuntu 24.04 and Bubblewrap

Planet Debian - Wed, 2024-04-24 03:46

When using Bubblewrap (the bwrap command) to create a container in Ubuntu 24.04 you can expect to get one of the following error messages:

bwrap: loopback: Failed RTM_NEWADDR: Operation not permitted bwrap: setting up uid map: Permission denied

This is due to Ubuntu developers deciding to use Apparmor to restrict the creation of user namespaces. Here is a Ubuntu blog post about it [1].

To resolve that you could upgrade to SE Linux, but the other option is to create a file named /etc/apparmor.d/bwrap with the following contents:

abi <abi/4.0>, include <tunables/global> profile bwrap /usr/bin/bwrap flags=(unconfined) { userns, # Site-specific additions and overrides. See local/README for details. include if exists <local/bwrap> }

Then run “systemctl reload apparmor“.

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Categories: FLOSS Project Planets

Capellic: Frontend performance optimization for Drupal websites: Part 1

Planet Drupal - Wed, 2024-04-24 00:00
This is part 1 of a series of articles that defines our approach to frontend performance optimization. In this part we get into the details of an effective cache policy.
Categories: FLOSS Project Planets

Test and Code: 219: Building Django Apps &amp; SaaS Pegasus - Cory Zue

Planet Python - Tue, 2024-04-23 20:52

I'm starting a SaaS project using Django, and there are tons of decisions right out of the gate.
To help me navigate these decisions, I've brought on Cory Zue.   
Cory is the creator of SaaS Pegasus, and has tons of experience with Django.

Some of the topics discussed:

  • Building Django applications
  • SaaS Pegasus
  • placecard.me
  • What boilerplate projects are
  • Django cookiecutter
  • Cookiecutter
  • Which database to use, probably PostgreSQL
  • Authentication choises, probably Allauth
  • Docker, Docker for development, Docker for deployment
  • Deployment targets / hosting services. Render, Heroku, Fly.io, for PaaS options.
  • Front end frameworks. Bootstrap, Tailwind, DaisyUI, TailwindUI
  • HTMX vs React vs straight Django templates
  • Rockets
  • Font Awesome
  • and of course, SaaS Pegasus

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The Complete pytest Course

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<p>I'm starting a SaaS project using Django, and there are tons of decisions right out of the gate. <br>To help me navigate these decisions, I've brought on Cory Zue.   <br>Cory is the creator of <a href="https://www.saaspegasus.com/?via=brian">SaaS Pegasus</a>, and has tons of experience with Django.</p><p>Some of the topics discussed:</p><ul><li>Building Django applications</li><li><a href="https://www.saaspegasus.com/?via=brian">SaaS Pegasus</a></li><li>placecard.me</li><li>What boilerplate projects are</li><li>Django cookiecutter</li><li>Cookiecutter</li><li>Which database to use, probably PostgreSQL</li><li>Authentication choises, probably Allauth</li><li>Docker, Docker for development, Docker for deployment</li><li>Deployment targets / hosting services. Render, Heroku, Fly.io, for PaaS options.</li><li>Front end frameworks. Bootstrap, Tailwind, DaisyUI, TailwindUI</li><li>HTMX vs React vs straight Django templates</li><li>Rockets</li><li>Font Awesome</li><li>and of course, <a href="https://www.saaspegasus.com/?via=brian">SaaS Pegasus</a></li></ul> <br><p><strong>Sponsored by Mailtrap.io</strong></p><ul><li>An Email Delivery Platform that developers love. </li><li>An email-sending solution with industry-best analytics, SMTP, and email API, SDKs for major programming languages, and 24/7 human support. </li><li>Try for Free at <a href="https://l.rw.rw/pythontest">MAILTRAP.IO</a></li></ul><p><strong>Sponsored by PyCharm Pro</strong></p><ul><li>Use code PYTEST for 20% off PyCharm Professional at <a href="https://www.jetbrains.com/pycharm/">jetbrains.com/pycharm</a></li><li>Now with Full Line Code Completion</li><li>See how easy it is to run pytest from PyCharm at <a href="https://pythontest.com/pycharm/">pythontest.com/pycharm</a></li></ul><p><strong>The Complete pytest Course</strong></p><ul><li>For the fastest way to learn pytest, go to <a href="https://courses.pythontest.com/p/complete-pytest-course">courses.pythontest.com</a></li><li>Whether your new to testing or pytest, or just want to maximize your efficiency and effectiveness when testing.</li></ul>
Categories: FLOSS Project Planets

Brian Perry: Drupal API Client 1.0 Release

Planet Drupal - Tue, 2024-04-23 20:00

We're extremely excited to announce the 1.0 release of the Drupal API Client. This release includes a fully functional JSON:API client and completes our commitment as a result of funding from the 'Pitch-burgh' innovation contest.

Before diving into the details of some recent updates, let's recap the state of the project now that it has reached 1.0.

What is the Drupal API Client?

The Drupal API Client is a set of JavaScript packages that simplify the process of interacting with common Drupal APIs. Most commonly, developers will use our JSON:API client to interface with Drupal's JSON:API endpoints, but we also publish a base API Client package that can be extended, a client for Decoupled Router, and may support other Drupal APIs in the future.

The Drupal API Client takes great care to be framework-agnostic and universal. It can be used:

  • with your JavaScript framework of choice, vanilla JavaScript, or even in Drupal itself.
  • with or without TypeScript.
  • on the server, or on the client.
  • with a bundler, or as a script import from a CDN.
Recent Developments See you at Stanford WebCamp and DrupalCon!

Moving forward, we hope to prioritize additional features for projects that could use our libraries as a dependency. Catch up with us at community events in May to learn more and share your use cases.

  • The Drupal API Client will be featured in a session at Stanford WebCamp. Sessions are free and virtual, so this is a great way to get a more detailed overview of the project.
  • We'll be holding a Birds of a Feather discussion and participating in contribution events at DrupalCon Portland. The BOF will be on Monday, May 6 in room G129 at 4PM.

Beyond these events, we're always available in the #api-client channel on Drupal Slack and monitoring our issue queue. Hope to see you there!

Categories: FLOSS Project Planets

Seth Michael Larson: Open Source Summit North America 2024

Planet Python - Tue, 2024-04-23 20:00
Open Source Summit North America 2024 AboutBlogNewsletterLinks Open Source Summit North America 2024

Published 2024-04-24 by Seth Larson
Reading time: minutes

This critical role would not be possible without funding from the Alpha-Omega project. Massive thank-you to Alpha-Omega for investing in the security of the Python ecosystem!

Last week I attended SOSS Community Day and OSS Summit. It was great to catch up with friends and to meet new people for the first time at a cross-ecosystem open source event.

I gave a talk "Embrace the Differences: Securing software ecosystems where they are" which funnily enough had a complementary talk about the ways software repositories can collaborate for security.

My talk focused on how security standards and tools typically want to operate across software ecosystems and differences in standards, tools, maintainers, and user expectations between ecosystems can make that difficult.

You can download my slides and the recording will be available eventually on YouTube.

OpenSSF Tabletop Session

I also participated in the first OpenSSF Tabletop Session organized and hosted by Dana Wang. I played the role of "open source maintainer" and represented how an exploited zero-day vulnerability would appear from the perspective of an open source project.

I emphasized the realities of vulnerability disclosure to open source projects like under-resourcing, most maintainers being volunteers, and stress caused during times of crisis.

Cast of the tabletop session! So many people! I also met up with many folks doing open source security, maintenance, and funding:

  • Met with many folks from the Alpha-Omega cohort. I'm looking forward to having more cross-functional discussions about new approaches to securing open source.
  • Met with Michael Winser from Alpha-Omega to work on our PyCon US 2024 talk State of Supply Chain Security for Python.
  • Met with my friend William Woodruff from Trail of Bits and discussed the system TLS proposal and build provenance for Homebrew (and what could be learned for Python).
  • Met with Samuel Giddins and Martin Emde from the Ruby ecosystem to discuss shared challenges for introducing security into an ecosystem.
  • Met Lauren Hanford from Tidelift to discuss supporting and funding maintainers.
  • Met Mirko from Sovereign Tech Fund and discuss their program for hiring open source maintainers.
  • Attended the talk by Kara Sowles from GitHub on the state of open source funding and learned about "downturn-resilient" funding.
  • Many folks who asked me about security initiatives happening in the Python ecosystem.
Other items

Note that I've been summoned for jury duty starting next week, so expect fewer updates over the next two weeks depending on how that goes.

That's all for this week! 👋 If you're interested in more you can read last week's report.

Thanks for reading! ♡ Did you find this article helpful and want more content like it? Get notified of new posts by subscribing to the RSS feed or the email newsletter.

This work is licensed under CC BY-SA 4.0

Categories: FLOSS Project Planets

PyCoder’s Weekly: Issue #626 (April 23, 2024)

Planet Python - Tue, 2024-04-23 15:30

#626 – APRIL 23, 2024
View in Browser »

Asyncio Handle Control-C (SIGINT)

When the user presses CTRL-C on the keyboard, the OS raises an interrupt signal to your program. When writing concurrent code this can get complicated as the signal goes to the process. This article shows you how to handle capturing CTRL-C elegantly when using asyncio.
JASON BROWNLEE

Using raise for Effective Exceptions

In this video course, you’ll learn how to raise exceptions in Python, which will improve your ability to efficiently handle errors and exceptional situations in your code. This way, you’ll write more reliable, robust, and maintainable code.
REAL PYTHON course

Securing Python and Open Source Ecosystems

Join this fireside chat featuring Dustin Ingram, Fellow at the Python Software Foundation (PSF), as we discuss trust and security for PyPI and other repositories in light of recent attacks, and initiatives such as Trusted Publishing - Tune in this Thursday! →
ACTIVESTATE sponsor

Ruff Gets a Big Speed-Up

Ruff has changed from a generated parser to a hand-written recursive descent parser in the latest release. This has resulted in >2x speedup in its linting performance. This article covers what has changed and why they did it.
DHRUV MANILAWALA

Quiz: Managing Multiple Python Versions With pyenv

REAL PYTHON

Articles & Tutorials OpenStreetMaps, Overpass API and Python

OpenStreetMaps (OSM) is an an open source mapping project that allows people to browse the world map and to plan routes. Not only does it have the expected web interface, but it also has an API known as Overpass. This article shows you two ways to use Python to query Overpass.
JUDITH VOCKENROTH

Python Gotcha: strip Can Remove More Than Expected

The Python strip, lstrip, and rstrip functions can have unexpected behavior: they strip a list of characters, not strings. Even though this is documented, it can lead to unexpected results. This post explains what happens and shows you two functions to use instead.
ANDREW WEGNER

Decoupling Systems to Get Closer to the Data

What are the benefits of using a decoupled data processing system? How do you write reusable queries for a variety of backend data platforms? This week on the show, Phillip Cloud, the lead maintainer of Ibis, will discuss this portable Python dataframe library.
REAL PYTHON podcast

Announcing py2wasm: A Python to Wasm Compiler

Wasmer, a company that builds Wasm tools, has announced py2wasm which converts your Python programs to WebAssembly, running at 3x faster speeds than direct Wasm. This post introduces you to the tool and shows how they took advantage of the Nuitka library.
SYRUS AKBARY

How to Format Floats Within F-Strings in Python

In this tutorial, you’ll learn how to use Python format specifiers within an f-string to allow you to neatly format a float to your required precision. You’ll also learn how to extract digits from existing strings and format them as well.
REAL PYTHON

Memory Management in mpmetrics

The mpmetrics library contains tools for determining runtime metrics on your code. To do this it requires some esoteric memory management techniques normally not undergone in Python. This post describe what they’ve done and why.
TRENDS BLOG

The Time Complexities Python Data Structures in Python

Big O notation describes the relationship between an algorithm, how much data it is using, and the time it takes to run. This article covers the time complexities of a variety of Python data structures.
TREY HUNNER

Django Project on NGINX Unit

Unit is a web server developed by the NGINX folks with pluggable support for Python using WSGI and ASGI. Aidas tried it out and this post talks about how he got some Django code working on this server.
AIDAS BENDORAITIS

I Asked 100 Devs Why They Aren’t Shipping Faster?

Daksh asked 100 developers why they aren’t shipping faster and this blog post shares what he learned. Problems include dependency bugs, overly complicated code bases, waiting on requirements, and more.
DAKSH GUPTA

Shape Typing in Python

This quick blog post shows you how to use Python type checking to ensure the dimensions of matrices being multiplied together. Typing is no longer just “is it an integer”.
JAMES FISHER

Software Needs to Be More Expensive

Open source is free, and although that is a good thing, it also means companies get to take without giving back. This opinion piece talks about how that should change.
GLYPH LEFKOWITZ

Projects & Code Master Python With Spaced Repetition

PYTHON CARDS

automathon: Simulate and Visualize Finite Automata

GITHUB.COM/ROHAQUINLOP

stamina: Production-Grade Retries for Python

GITHUB.COM/HYNEK

tenacity: Retrying Library for Python

GITHUB.COM/JD

auto_venv: Say Goodbye to Manual Setup or Install

GITHUB.COM/AMAL-KHAILTASH

escaping: Suppress Exceptions With Callbacks and Logs

GITHUB.COM/POMPONCHIK • Shared by Evgeniy Blinov

Events Weekly Real Python Office Hours Q&A (Virtual)

April 24, 2024
REALPYTHON.COM

SPb Python Drinkup

April 25, 2024
MEETUP.COM

Django Girls Ekpoma Workshop

April 26 to April 28, 2024
DJANGOGIRLS.ORG

Open Source With Python

April 27, 2024
MEETUP.COM

PythOnRio Meetup

April 27, 2024
PYTHON.ORG.BR

Launching Python Niger

April 28 to April 29, 2024
FB.ME

Happy Pythoning!
This was PyCoder’s Weekly Issue #626.
View in Browser »

[ Subscribe to 🐍 PyCoder’s Weekly 💌 – Get the best Python news, articles, and tutorials delivered to your inbox once a week >> Click here to learn more ]

Categories: FLOSS Project Planets

Open Source AI Definition on the road: Looking back and forward

Open Source Initiative - Tue, 2024-04-23 13:15

With version 0.0.7 of the Open Source AI Definition just published, we are getting very close to a release candidate version in June, as planned. We’ve covered a lot of ground since FOSDEM 2024, where we presented draft 0.0.4. This month we presented at Open Source Summit North America (OSS NA 24) and ran a co-design workshop at the Legal and Licensing Workshop (LLW) in Gothenburg. We’re very close to a “feature complete”: below are the next steps and ideas on how you might get involved.

Opportunities to meet in person

We are taking the draft definition on the road and coming to a town near you! Or, kind of, that is if you live in any of the following cities or happen to be there on the given dates:

  1. North America 
    1. USA, Pittsburgh, PyCon US (May 17)
    2. USA, NYC OSPOs for Good (July 9-11)
    3. USA, Raleigh, All Things Open (October 27-29)
  2. Europe
    1. France, Paris, OW2 (June)
    2. France, Paris, data governance event (September)
  3. Africa
    1. Nigeria, Lagos, Sustain Africa (June)
  4. Latin America
    1. Argentina, Buenos Aires, Nerdearla (September 24-28)
  5. Asia Pacific
    1. Hong Kong, AI_Dev (August 23)

It’s important for you to catch up.

Draft v.0.0.5 at FOSDEM 2024

The talk “Moving a Step Closer to Defining Open Source AI” (click here to watch the recorded live stream) by Stefano Maffulli presented draft v.0.0.5, released a few days before. The process at the time was focusing on finding the required components to “use, study, share and modify” an AI system. 

Maffulli quickly summarized why OSI started the Deep Dive: AI process, after Copilot not only demonstrated machines’ ability to write functioning code but also highlighted the new role of data as input to the machine learning system. Recognizing there is no simple answer to the question “what is the source code of Copilot?” Maffulli focused OSI’s attention to finding the Open Source principles applied to AI together with stakeholders from academia, legal communities, tech companies, and civil rights groups.

Building the framework

OSI defined a process to co-design the Open Source AI Definition in public. This framework encompasses a clear definition of AI systems, a preamble outlining the rationale behind open source AI, a concise articulation of the freedoms users should enjoy, and a checklist for evaluating AI components and associated legal documents.

He highlighted the rapid progress and policy decisions that shaped the trajectory of software development, emphasizing the need to compress decades of evolution into a few months in the realm of AI. Stefano emphasized the importance of community feedback and collaboration in refining the definition of Open Source AI. With monthly draft releases, bi-weekly town halls, and an active forum, we gather diverse perspectives and insights to craft a robust definition.

OSS North America 2024 and next steps

Since FOSDEM, the Definition has reached version 0.0.7. First, working groups analyzed Pythia, OpenCV, Llama2 and Bloom  to find the preferred form of making modifications to the AI system, the fundamental unit for users to exercise their freedoms. Later, the groups shifted focus to reviewing the legal frameworks used by the components used by Pythia, OpenCV, Llama2 and Bloom. Together with the definition of AI system provided by the OECD, the preamble, out-of-scope issues and four freedoms, this draft looks very close to a full document. A new version is expected to be released very soon now. On the 16th of April, Ofer Hermoni of the Linux Foundation and Mer Joyce (OSI/DoBigGood) presented the work at the OSS NA 24 meeting in Seattle. A huge part of our job currently is getting this definition reviewed by as many stakeholders as possible. A far-reaching and diverse perspective is necessary as we aim for a global impact. 
To participate in shaping the definition of Open Source AI and stay updated on the latest developments, visit opensource.org/deepdive and engage with the ongoing discussions, participate and watch previous town hall meetings and draft releases. Go to discuss.opensource.org to participate in our forum.

Categories: FLOSS Research

Dries Buytaert: Evolving Drupal's Layout Builder to an Experience Builder

Planet Drupal - Tue, 2024-04-23 13:04

Imagine a world where installing Drupal instantly launches you into a creative experience, allowing you to build and style pages right out of the box, without any need for additional modules or configuration.

The introduction of Drupal's Layout Builder in 2018 was an important milestone toward this vision, but it was just the first step. Layout Builder provides site builders with a powerful drag-and-drop interface for creating and arranging content within customizable layouts.

Despite its success, there is a clear and pressing need to improve the existing Layout Builder. The numerous community-developed modules enhancing Layout Builder highlight the need for a more comprehensive solution.

That is why at DrupalCon Lille last year, I was excited to announce the "Next Generation Page Builder" initiative, aimed at improving and expanding the Layout Builder to provide a truly intuitive, out-of-the-box page-building experience.

Since announcing the 'Next Generation Page Builder', led by Lauri Eskola (Acquia), a Drupal Core Committer, we've done extensive research and planning.

Inspired by user feedback, we decided to make two changes. First, we decided to broaden our focus: not only will we improve the page-building features of Layout Builder, we will also integrate basic theming capabilities, enabling users to style their pages effortlessly without having to edit Twig files. Second, reflecting on this wider scope, we renamed the initiative from 'Next Generation Page Builder' to 'Experience Builder'.

In recent months, we explored several options for how to create such an Experience Builder, including accelerating development of the Layout Builder, switching to Gutenberg, adopting Paragraphs, or using the newly open-sourced Plasmic.

After thorough analysis and discussions with key stakeholders, including Automattic's Gutenberg team, the Drupal Core Committers decided the best approach is to expand the Layout Builder while also incorporating the best elements of Paragraphs.

Looking to the future, I hope the Experience Builder becomes the preferred Drupal tool for layout design, page building, and basic theming. Our main goal is to create a tool that site builders love, with an amazing out-of-the-box experience. By integrating key features from Paragraphs, we also aim to create a unified solution that reduces fragmentation, accelerates innovation, and ensures Drupal remains at the forefront of site building.

Our future success hinges on expanding Drupal's usability to a wider audience. Our CMS capabilities are often better than our competitors', but aren't always as user friendly. In the Drupal 7 era, Drupal was the OG (Original Great) of low-code but today we are being outpaced by competitors in terms of ease of use. Without user experience improvements, we'll lose ground. The Experience Builder initiative is all about introducing more people to the power of Drupal.

I feel strongly that a unified Experience Builder is one of the most important initiatives we can undertake right now.

Developing an Experience Builder is a big task that will require substantial effort, extensive collaboration, and significant expertise in user experience and design. As Drupal Core Committers, we are driven by a sense of urgency to advance this initiative. We are committed to moving quickly and iterating rapidly, but to succeed, we also need your support. There will be many opportunities for the community to collaborate and contribute to this initiative.

For more information, please check Lauri's latest blog post on the topic. Additionally, I will discuss this further in my upcoming DrupalCon Portland keynote in a few weeks.

Categories: FLOSS Project Planets

Drupal Core News: Working toward an Experience Builder

Planet Drupal - Tue, 2024-04-23 11:51

At DrupalCon Lille 2023, Dries announced a new strategic initiative to build a Next Generation Page Builder. The goal of the initiative was to improve and expand Layout Builder to provide a truly intuitive out-of-the-box page building experience.

We have started defining what experience would look like by identifying user journeys from beginning to end, from customizing Drupal to match a brand and content strategy to creating and editing pages. We have identified that to provide the desired experience, we need to define a standardized way for builders and creators to transform designs into optimized digital experiences. To realize the Ambitious Site Builder vision announced by Dries in 2022, we are providing visual, browser-based tools that require minimal technical expertise. This will make it easier for users without prior knowledge about Drupal or coding to implement a digital experience with Drupal. Our working name for this is Experience Builder to highlight that the module seamlessly integrates a page builder and a theme builder.

With the Experience Builder, site builders can create fully customized pages and themes using no-code/low-code tools in the browser. It provides site builders, developers, and content creators a single platform to collaborate. Content creators are empowered to create and update content without having to reach out to a developer. Site builders can balance brand consistency and creative freedom by selecting which visual editor controls to expose to the content creator. As a result, anyone in your organization can easily build and update sites, accelerating time to market while remaining brand compliant.

To keep the out-of-the-box experience simple for non-technical users, Drupal will continue to optimize the experience for site builders without the need of building custom, code-based headless front ends. We are actively exploring ways for Drupal to enable JavaScript developers to work with Drupal without the need of managing a large custom code base. Meanwhile, we will still deliver capabilities that enable headless use cases and retain much of the work that has been done to enable headless use cases so far.

How should we build the Experience Builder?

The Drupal core committer team has decided to expand on our existing solutions. Incorporating the best features of Paragraphs into an expanded Layout Builder will provide a solution that can significantly surpass the existing options explored. We are still evaluating if there are smaller components that exist in other open source projects that could be utilized by the Experience Builder.

What options did we consider?

We researched the existing Drupal based page building solutions, as well as other open source projects to decide how we should realize the Experience Builder. We evaluated Paragraphs, Layout Builder, and Gutenberg using six criteria: expertise required to realize our vision, effort required to realize our vision, effort required to migrate existing sites, future-proofness of the solutions, how well it matches with our persona, and ability for market differentiation.

Gutenberg was the primary option that we considered adopting from outside the Drupal ecosystem. With the help of the Pitchburgh fund, I had couple long days of working sessions with a group of Gutenberg maintainers, as well as the team behind Drupal Gutenberg. We learned that there are many parallels between the problems the different teams are aiming to solve. However, Gutenberg is primarily built for the content creators, which is at odds with our promise to build a platform for the Ambitious Site Builders. Gutenberg would provide us a fast way to enable content creators, but would slow us down delivering on our vision for site builders.

From the Drupal-based solutions, Paragraphs has the largest user base. Site builders attribute this to its relative simplicity and flexibility to implement nearly any kind of design system. However, Paragraphs focuses solely on component composition and content composition, and therefore doesn't enable non-technical builders to control the display of structured data, or the page as a whole.

Layout Builder originally focused on providing site builders with a way to display structured data from entities using more complex layouts. For this reason, the out-of-the-box experience hasn't been optimized for content creation. As a result, some sites using Paragraphs also choose to use Layout Builder as a tool for builders to customize the page layout, leading to a less integrated UX.

All of the solutions we evaluated came with trade-offs. The core committer team decided to prioritize how well the solution would match with our Ambitious Site Builder persona and having an ability for market differentiation. Based on our research, evolving Layout Builder, and enhancing it with capabilities that exist in Paragraphs today best meets these criteria. This approach requires a lot of expertise and effort to realize our vision, in particular UX design, but makes it easier to migrate existing sites and integrate with other Drupal APIs and use cases.

Next steps

We have identified three lanes of work to implement the Experience Builder:

  1. Creating a revamped user experience that is optimized for creating pages using components, as well as defining the layout for structured data.
  2. Implementing a new mechanism for defining components, alongside blocks. Components can be defined through the UI as no-code components, or as code components. The experience for creating code components will be similar to Single Directory Components.
  3. Implementing a browser-based theme builder that enables site builders to implement themes custom to brand without leaving the browser.
Expected timeline and call for help

The core committer team is convinced that a unified Experience Builder is one of the most important initiatives we can undertake. We are committed to moving quickly and iterating rapidly, but we need your support to succeed. We know that with the help of the community, we are able to develop a proof of concept and demo of the new user experience later this year. The first release as a contributed module is targeted for the first half of 2025.

If you are willing to help fund this project, you can reach out to Lauri or Dries. If you are willing to help with the implementation itself, we are planning to set up a recurring meeting. Join the #layouts channel on Drupal Slack for updates and opportunities to contribute!

Categories: FLOSS Project Planets

The Drop Times: Bridging Worlds: Aidan F. Dean Dunn on Reporting, Learning, and Connecting at DrupalCon

Planet Drupal - Tue, 2024-04-23 10:55
TDT hired a full-time journalist intern to cover DrupalCon Pittsburgh in 2023. Aidan F. Dean Dunn, just out of college, did a commendable job. Aidan talks about his experiences reporting at the tech conference in this conversation with Varun Baker.
Categories: FLOSS Project Planets

Real Python: Python Basics Exercises: Scopes

Planet Python - Tue, 2024-04-23 10:00

On your Python journey, you’ve worked with functions and loops. To fully understand functions and loops in Python, you need to be familiar with the issue of scope.

In this Python Basics Exercises video course, you’ll practice:

  • Identifying the scope of objects
  • Working with the global keyword
  • Exploring the LEGB rule for scope resolution
  • Using the return statement in a function

Scope can be one of the more difficult programming concepts to understand, so in this video course, you’ll get additional practice working with it.

This video course is part of the Python Basics series, which accompanies Python Basics: A Practical Introduction to Python 3. You can also check out the other Python Basics courses.

Note that you’ll be using IDLE to interact with Python throughout this course. If you’re just getting started, then you might want to check out Python Basics: Setting Up Python before diving into this course.

[ Improve Your Python With 🐍 Python Tricks 💌 – Get a short & sweet Python Trick delivered to your inbox every couple of days. >> Click here to learn more and see examples ]

Categories: FLOSS Project Planets

Django Weblog: DjangoCon US 2024 CFP Last Call

Planet Python - Tue, 2024-04-23 10:00

Hey Django enthusiasts!

Have you submitted your talk or tutorial for DjangoCon US 2024, in beautiful Durham, North Carolina, USA?

Time flies, and we're fast approaching the deadline (April 24, 2024 at 12 PM EDT) for DjangoCon US 2024 Call for Proposals (CFP). If you've been pondering sharing your Django journey, showcasing your innovative projects, or imparting your expertise to fellow developers, now is the perfect moment to seize the opportunity!

Here's why you should take action and submit your proposals before the clock runs out:

  • Share Your Knowledge: DjangoCon US isn't just a conference; it's a platform for sharing insights, discoveries, and lessons learned. Your unique experiences could be just what someone else needs to overcome a hurdle or spark a new idea.
  • Join the Community: DjangoCon US isn't just about talks; it's about building connections. By presenting at the conference, you become an integral part of the vibrant Django community, exchanging ideas, and forging new friendships with like-minded developers.
  • Boost Your Profile: Whether you're a seasoned speaker or a first-time presenter, DjangoCon US offers a valuable opportunity to elevate your profile in the tech industry. Showcase your expertise, gain visibility, and enhance your professional credibility among peers and potential employers.
  • Contribute to Diversity: DjangoCon US values diversity and inclusion. Your perspective matters, and by sharing your voice, you contribute to creating a more inclusive and representative tech community.

Submitting a proposal is easy! Just head over to the DjangoCon US website, fill out the submission form, and share your compelling idea with us. Whether it's a deep dive into a technical topic, a case study of your latest project, or a discussion on the future of Django, we want to hear from you.

Remember, the deadline for CFP submissions is fast approaching, so don't wait until the last minute. Take this opportunity to inspire, educate, and connect with your fellow Django enthusiasts at DjangoCon US 2024!

See you at the conference!

If you have questions feel free to contact us.

Categories: FLOSS Project Planets

DrupalEasy: cspell and drupalorg CLI: two useful tools for Drupal contrib module maintainers

Planet Drupal - Tue, 2024-04-23 08:34

While preparing the recent Markdown Easy 1.0.1 release, I utilized a couple of tools that I hadn't used before in order to help improve code quality as well as the quality of the release notes.

cspell

cspell is a Node.js spell-checker for code that was made available to the default Drupal GitLab templates in February, 2024. There is a new SKIP_CSPELL variable that can be set if you'd like your project to completely ignore cspell (it is enabled by default.) Documentation on using cspell in Drupal GitLab pipelines is available. I'd wager that most Drupal contrib maintainers will have the need for a custom word list (as I did,) so I took a few minutes to learn a bit more about it.

Cspell uses its default wordlist along with a few add-on dictionaries related to Drupal development (anecdotally, words like "mglaman," "gloop," "skynet," and "vampirize" are included) for checking the spelling of both variable names as well as code comments, but luckily, additional words (and patterns) can be added on a per-project basis in order to achieve a clean cspell report in GitLab pipelines. While there are several methods to add a list of custom words, the way I felt was most elegant (and easy for me to remember in the future!) was to add a .cspell-project-words.txt file on the project root (in this case, the contrib module is the project.) This file then includes a list of words that cspell should not flag as misspellings. For the Markdown Easy project, I went with "Anello," "~commonmark," and "~ultimike" (possibly for obvious reasons.) The ~ modifier indicates those words are case-insensitive (additional modifiers are available.) With that change, Markdown Easy now earns a passing score from the cspell pipeline. 

drupalorg CLI

drupalorg is a command-line interface maintained by (who else?) Matt Glaman. I actually learned about this tool a few years ago after Matt blogged about it, but for whatever reason, I only thought about installing and (finally) using it recently. The general idea is to provide a command line tool for contributors to interact with drupal.org. It's available commands are:

help Displays help for a command list Lists commands cache cache:clear (cc) Clears caches ci drupalci drupalci:list (ci:l) Lists test results for an issue drupalci:watch (ci:w) Watches a Drupal CI job issue issue:apply Applies the latest patch from an issue. issue:branch Creates a branch for the issue. issue:interdiff Generate an interdiff for the issue from local changes. issue:link Opens an issue issue:patch Generate a patch for the issue from committed local changes. maintainer maintainer:issues (mi) Lists issues for a user, based on maintainer. maintainer:release-notes (rn, mrn) Generate release notes. project project:issues (pi) Lists issues for a project. project:kanban Opens project kanban project:link Opens project page project:release-notes (prn) View release notes for a release project:releases Lists available releases tci travisci travisci:list (tci:l) Lists Travis Ci builds for a Drupal project travisci:watch (tci:w) Watches a Travis CI job

The maintainer:release-notes command is especially helpful to automatically generate release notes for a new version of a Drupal contrib project. Here's how I installed and used this tool to generate the release notes for Markdown Easy 1.0.1:

  1. I downloaded the drupalorg.phar to a new ~/sites/drupalorg/ directory on my local, and renamed the file to just drupalorg.
  2. I then gave execute permission to this file via chmod u+x ~/sites/drupalorg/drupalorg
  3. I use zsh, so I added the following to my ~/.zshrc file and then restarted my terminal:

    # drupalorg command line tool export PATH="/Users/michael/sites/drupalorg:$PATH"
  4. Here's the important part - I then navigated to my local, working copy of the Markdown Easy module. In my case cd ~/sites/d10/web/modules/contrib/markdown_easy 
  5. I then ran the following command to generate the release notes: drupalorg maintainer:release-notes 1.0.0  

I assumed at first that I should use the current release (1.0.1) as the argument, but after reading the documentation, I discovered that the command will generate release notes from the tag provided in the argument.

I also originally assumed that the command would take a contrib module's machine name as an argument, but after a few minutes of poking around the documentation, I realized that the command must be run from the module's directory.

You can see the automatically generated release notes here.

Summary

Both of these tools were rather easy to implement (once I read just a little bit of documentation) and seem like they'll be useful for just about any Drupal contrib maintainer. 

Categories: FLOSS Project Planets

PyPy: PyPy v7.3.16 release

Planet Python - Tue, 2024-04-23 08:22
PyPy v7.3.16: release of python 2.7, 3.9, and 3.10

The PyPy team is proud to release version 7.3.16 of PyPy.

This release includes security fixes from upstream CPython, and bugfixes to the garbage collector, described in a gc bug-hunt blog post.

The release includes three different interpreters:

  • PyPy2.7, which is an interpreter supporting the syntax and the features of Python 2.7 including the stdlib for CPython 2.7.18+ (the + is for backported security updates)

  • PyPy3.9, which is an interpreter supporting the syntax and the features of Python 3.9, including the stdlib for CPython 3.9.19.

  • PyPy3.10, which is an interpreter supporting the syntax and the features of Python 3.10, including the stdlib for CPython 3.10.14.

The interpreters are based on much the same codebase, thus the multiple release. This is a micro release, all APIs are compatible with the other 7.3 releases. It follows after 7.3.15 release on Jan 15, 2024

We recommend updating. You can find links to download the v7.3.16 releases here:

https://pypy.org/download.html

We would like to thank our donors for the continued support of the PyPy project. If PyPy is not quite good enough for your needs, we are available for direct consulting work. If PyPy is helping you out, we would love to hear about it and encourage submissions to our blog via a pull request to https://github.com/pypy/pypy.org

We would also like to thank our contributors and encourage new people to join the project. PyPy has many layers and we need help with all of them: bug fixes, PyPy and RPython documentation improvements, or general help with making RPython's JIT even better.

If you are a python library maintainer and use C-extensions, please consider making a HPy / CFFI / cppyy version of your library that would be performant on PyPy. In any case, both cibuildwheel and the multibuild system support building wheels for PyPy.

What is PyPy?

PyPy is a Python interpreter, a drop-in replacement for CPython It's fast (PyPy and CPython 3.7.4 performance comparison) due to its integrated tracing JIT compiler.

We also welcome developers of other dynamic languages to see what RPython can do for them.

We provide binary builds for:

  • x86 machines on most common operating systems (Linux 32/64 bits, Mac OS 64 bits, Windows 64 bits)

  • 64-bit ARM machines running Linux (aarch64).

  • Apple M1 arm64 machines (macos_arm64).

  • s390x running Linux

PyPy support Windows 32-bit, Linux PPC64 big- and little-endian, and Linux ARM 32 bit, but does not release binaries. Please reach out to us if you wish to sponsor binary releases for those platforms. Downstream packagers provide binary builds for debian, Fedora, conda, OpenBSD, FreeBSD, Gentoo, and more.

What else is new?

For more information about the 7.3.16 release, see the full changelog.

Please update, and continue to help us make pypy better.

Cheers, The PyPy Team

Categories: FLOSS Project Planets

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