#91: Will there be a PyBlazor?
Published Wed, Aug 15, 2018, recorded Thu, Aug 2, 2018
Sponsored by Datadog pythonbytes.fm/datadog
Brian #1: What makes the Python Cool
- Shankar Jha
- “some of the cool feature provided by Python”
- The Zen of Python:
- Swapping of two variable in one line:
a, b = b, a
- Create a web server using one line:
python -m http.server 8000
- Looping with index:
- reverse a list:
- list/set/dict comprehensions
- Modern dictionary
_when in interactive REPL
- Lots of great external libraries
Michael #2: Django 2.1 released
- The release notes cover the smorgasbord of new features in detail, the model “view” permission is a highlight that many will appreciate.
- Django 2.0 has reached the end of mainstream support. The final minor bug fix release (which is also a security release), 2.0.8, was issued today.
- model “view” feature: This allows giving users read-only access to models in the admin.
- The new
[ModelAdmin.delete_queryset()](https://docs.djangoproject.com/en/2.1/ref/contrib/admin/#django.contrib.admin.ModelAdmin.delete_queryset)method allows customizing the deletion process of the “delete selected objects” action.
- You can now override the default admin site.
- Lots of ORM features
- Cache: The local-memory cache backend now uses a least-recently-used (LRU) culling strategy rather than a pseudo-random one.
- Migrations: To support frozen environments, migrations may be loaded from
- Lots more
Brian #3: Awesome Python Features Explained Using Harry Potter
- Anna-Lena Popkes
- Initial blog post
- 100 Days of code, with a Harry Potter universe bent.
- Up to day 18 so far.
Michael #4: Executing Encrypted Python with no Performance Penalty
- Deploying Python in production presents a large attack surface that allows a malicious user to modify or reverse engineer potentially sensitive business logic.
- This is worse in cases of distributed apps.
- Common techniques to protect code in production are binary signing, obfuscation, or encryption. But, these techniques typically assume that we are protecting either a single file (EXE), or a small set of files (EXE and DLLs).
- In Python signing is not an option and source code is wide open.
- requirements were threefold:
- Work with the reference implementation of Python,
- Provide strong protection of code against malicious and natural threats,
- Be performant both in execution time and in stored space
- This led to a pure Python solution using authenticated cryptography.
- Created a
.pycefile that is encrypted and signed
- Customized import statement to load and decrypt them
- Implementation has no overhead in production. This is due to Python's in-memory bytecode cache.
Brian #5: icdiff and pytest-icdiff
- icdiff: “Improved colored diff”
- Jeff Kaufman
- pytest-icdiff: “better error messages for assert equals in pytest”
- Harry Percival
Michael #6: Will there be a PyBlazor?
- The .NET guys, and Steve Sanderson in particular, are undertaking an interesting project with WebAssembly.
- WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based virtual machine. Wasm is designed as a portable target for compilation of high-level languages like C/C++/Rust, enabling deployment on the web for client and server applications.
- Works in Firefox, Edge, Safari, and Chrome
- Their project, Blazor, has nearly the entire .NET runtime (AKA the CLR) running natively in the browser via WebAssembly.
- This is notable because the CLR is basically pure C code. What else is C code? Well, CPython!
- Includes Interpreted and AOT mode:
- Ahead-of-time (AOT) compiled mode: In AOT mode, your application’s .NET assemblies are transformed to pure WebAssembly binaries at build time.
- Being able to run .NET in the browser is a good start, but it’s not enough. To be a productive app builder, you’ll need a coherent set of standard solutions to standard problems such as UI composition/reuse, state management, routing, unit testing, build optimization, and much more.
- Mozilla called for this to exist for Python, but sadly didn’t contribute or kick anything off at PyCon 2018: https://www.youtube.com/watch?v=ITksU31c1WY
Extras and personal info:
- Building data-driven web apps course is being well received
- Guido van Rossum: Python 3 retrospective — Guido’s final presentation as BDFL