#138 Will PyOxidizer weld shut one of Python's major gaps?
Python Bytes - Podcast tekijän mukaan Michael Kennedy and Brian Okken - Maanantaisin
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Sponsored by DigitalOcean: pythonbytes.fm/digitalocean
Brian #1: flake8-comprehensions
- submitted by Florian Dahlitz
- I’m already using flake8, so adding this plugin is a nice idea.
- checks your code for some generator and comprehension questionable code.
- C400 Unnecessary generator - rewrite as a list comprehension.
- C401 Unnecessary generator - rewrite as a set comprehension.
- C402 Unnecessary generator - rewrite as a dict comprehension.
- C403 Unnecessary list comprehension - rewrite as a set comprehension.
- C404 Unnecessary list comprehension - rewrite as a dict comprehension.
- C405 Unnecessary (list/tuple) literal - rewrite as a set literal.
- C406 Unnecessary (list/tuple) literal - rewrite as a dict literal.
- C407 Unnecessary list comprehension - '[HTML_REMOVED]' can take a generator.
- C408 Unnecessary (dict/list/tuple) call - rewrite as a literal.
- C409 Unnecessary (list/tuple) passed to tuple() - (remove the outer call to tuple()/rewrite as a tuple literal).
- C410 Unnecessary (list/tuple) passed to list() - (remove the outer call to list()/rewrite as a list literal).
- C411 Unnecessary list call - remove the outer call to list().
- Example:
- Rewrite
list(f(x) for x in foo)
as[f(x) for x in foo]
- Rewrite
set(f(x) for x in foo)
as{f(x) for x in foo}
- Rewrite
dict((x, f(x)) for x in foo)
as{x: f(x) for x in foo}
- Rewrite
Michael #2: PyOxidizer (again)
- Michael’s assessment - There are three large and looming threats to Python. Lack of
- A real mobile development story
- GUI applications on desktop operating systems
- Sharing your application with users (this is VERY far from deployment to servers)
- Cover PyOxidizer before but seems to have just rocketed off last couple of weeks.
- At their PyCon 2019 keynote talk, Russel Keith-Magee identified code distribution as a potential black swan - an existential threat for longevity - for Python.
- “Python hasn't ever had a consistent story for how I give my code to someone else, especially if that someone else isn't a developer and just wants to use my application.”
- They announced the first release of PyOxidizer (project, documentation), an open source utility that aims to solve the Python application distribution problem!
- PyOxidizer's marquee feature is that it can produce a single file executable containing a fully-featured Python interpreter, its extensions, standard library, and your application's modules and resources.
- You can have a single
.exe
providing your application. - Unlike other tools in this space which tend to be operating system specific, PyOxidizer works across platforms (currently Windows, macOS, and Linux - the most popular platforms for Python today).
- PyOxidizer loads everything from memory and there is no explicit I/O being performed. When you
**import**
a Python module, the bytecode for that module is being loaded from a memory address in the executable using zero-copy. - This makes PyOxidizer executables faster to start and
import
- faster than apython
executable itself!
Brian #3: Using changedir
to avoid the need for src
- I’ve been experimenting with combining flit, pytest, tox, and coverage for new projects.
- And in doing so, ran across a cool feature of tox that I didn’t know about before,
changedir
. - It’s a feature of tox to allow you to run tests in a different directory than the top level project directory.
- I talk about this more in episode 80 of Test & Code.
- As an example project I build yet another markdown converter using regular expressions.
- This is funny to me, considering the recent cloudflare outage due to a single regular expression. https://blog.cloudflare.com/cloudflare-outage/
- “Tragedy is what happens to me, comedy is what happens to you” - Mel Brooks approximate quote.
Michael #4: WebRTC and ORTC implementation for Python using asyncio
- Web Real-Time Communication (WebRTC) - WebRTC is a free, open project that provides browsers and mobile applications with Real-Time Communications (RTC) capabilities via simple APIs.
- Object Real-Time Communication (ORTC) - ORTC (Object Real-Time Communications) is an API allowing developers to build next generation real-time communication applications for web, mobile, or server environments.
- The API closely follows its Javascript counterpart while using pythonic constructs:
- promises are replaced by coroutines
- events are emitted using
pyee.EventEmitter
- The main WebRTC and ORTC implementations are either built into web browsers, or come in the form of native code.
- In contrast, the
aiortc
implementation is fairly simple and readable.- Good starting point for programmers wishing to understand how WebRTC works or tinker with its internals.
- Easy to create innovative products by leveraging the extensive modules available in the Python ecosystem.
- For instance you can build a full server handling both signaling and data channels or apply computer vision algorithms to video frames using OpenCV.
Brian #5: Apprise - Push Notifications that work with just about every platform!
- listener suggestion
- cool shim project to allow multiple notification services in one app
- “Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Pushbullet, Slack, Twitter, etc.
- One notification library to rule them all.
- A common and intuitive notification syntax.
- Supports the handling of images (to the notification services that will accept them).”
- supports
- notification services such as discord, gitter, ifttt, mailgun, mattermost, MS teams, twitter, …
- SMS notification through Twilio, Nexmo, AWS, D7
- email notifications
Michael #6: Websauna web framework
- Websauna is a full stack Python web framework for building web services and back offices with admin interface and sign up process https://websauna.org
- "We have web applications 80% figured out. Websauna takes it up to 95%.”
- Built upon Python 3, Pyramid, and SQLAlchemy.
- When to use it?
- Websauna is focused on Internet facing sites where you have a public or private sign up process and an administrative interface. Its sweet spots include custom business portals and software-as-a-service products which are too specialized for off-the-shelf solutions.
- Benefits
- Focus on core business logic as Websauna provides basic website building blocks like sign up and sign in.
- Low learning curve and friendly comprehensive documentation help novice developers
- Emphasis is on meeting business requirements with reliable delivery times, responsiveness, consistency
- Site operations is half the story. Websauna provides an automated deployment process and integrates with monitoring, security and other DevOps solutions.
Extras
Michael:
- Data driven Flask course is out!
Brian:
- Recent Test & Code episodes were solo because I’m in the middle of a work move and didn’t want to schedule interviews around a crazy work schedule. However, that should settle down in July and I can get back to getting great guests on the show. But I’m also having fun with solo topics, so I’ll keep that in the mix.
- upshot: if I’ve contacted you or you me about being on the show and you haven’t heard from me lately, give me a nudge with a DM or email or something.
Jokes
- An SQL query goes into a bar, walks up to two tables and asks, 'Can I join you?'
- Not a joke, really, but along the lines of “comedy when it happens to you”.
- Reset procedure for GE lightbulbs theregister.co.uk/2019/06/20/ge_lightblulb_reset