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#217: Use your cloud SSD for fast, cross-process caching

Published Tue, Jan 19, 2021, recorded Tue, Jan 19, 2021

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Special guest: Ogi Moore

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Michael #1: diskcache

  • via Ian Maurer
  • Python disk-backed cache (Django-compatible). Faster than Redis and Memcached. Pure-Python.
  • The cloud-based computing of 2020 puts a premium on memory. Gigabytes of empty space is left on disks as processes vie for memory.
  • Among these processes is Memcached (and sometimes Redis) which is used as a cache.
  • Wouldn't it be nice to leverage empty disk space for caching?
  • Features:
  • Pure-Python
  • Fully Documented
  • Benchmark comparisons (alternatives, Django cache backends)
  • 100% test coverage
  • Hours of stress testing
  • Performance matters
  • Django compatible API
  • Thread-safe and process-safe
  • Supports multiple eviction policies (LRU and LFU included)
  • Keys support "tag" metadata and eviction
  • Developed on Python 3.8
  • Tested on CPython 3.5, 3.6, 3.7, 3.8
  • Tested on Linux, Mac OS X, and Windows
  • Tested using Travis CI and AppVeyor CI

Brian #2: TOML is 1.0.0 now.

  • What does that mean for Python?
    • Hopefully, some kind of toml parser will make it into Python core.
  • Any Python access to 1.0.0? Mixed
    • Implementations and TOML version support page lists:
    • pytomlpp supports 1.0.0-rc.3, which is a wrapper around C++ tomlplusplus, which does support 1.0.0. Confusing
    • tomlkit supports 1.0.0-rc.1, so that’s promising
    • toml supports 0.5.0, great name. It’d be cool if it would support 1.0.0
  • What’s different between 0.5.0 and 1.0.0?
    • Unless I’m mistaken, not much: CHANGELOG
    • 1.0.0-rc1
    • Leading zeroes in exponent parts of floats are permitted.
    • Allow raw tab characters in basic strings and multi-line basic strings.
    • Allow heterogenous values in arrays.
    • Other than that, lots of “Clarify …”, which I’m not sure how those all affect implementation.
  • I’d love to hear more from people who know more about this

Ogi #3: pyqtgraph

  • pyqtgraph - plotting library, for when you need fast/interactive plots
  • Uses qt5 (and soon qt6) bindings to generate plots within Qt applications
  • Fills a niche role, want easy mouse interactivity, running locally on a machine
  • Often used in engineering/scientific applications when looking at a lot of data, and wanting interactivity

Michael #4: Parler + Python = Insurrection in public

  • via Jim Kring and Mark Little
  • According to Wikipedia: Parler (/ˈpɑːrlər/) is an American alt-tech microblogging and social networking service. Parler has a significant user base of Donald Trump supporters, conservatives, conspiracy theorists, and right-wing extremists.
  • ArsTechnica article send in by Mark Little
  • Ars: Parler’s amateur coding could come back to haunt Capitol Hill rioters
  • Coding mess
    • A key reason for her success: Parler’s site was a mess. Its public API used no authentication.
    • When users deleted their posts, the site failed to remove the content and instead only added a delete flag to it.
    • Oh, and each post carried a numerical ID that was incremented from the ID of the most recently published one.
    • Another amateur mistake was Parler’s failure to scrub geolocations from images and videos posted online.
  • Some 80 terabytes of posts, 1M videos, many already deleted, preserved for posterity.
  • Catalog and Python pointed out by Shaun King.
  • See the catalog (maybe, it’s the ugly side of people).
  • The gist:
  • Partially back online with Russian hosting service?

Brian #5: Best-of Web Development with Python

  • Suggested by Douglas Nichols
  • Cool list with nice icons
  • Covers
    • Frameworks, HTTP Clients, Servers
    • Auth tools, HTML Processing, URL utilities
    • OpenAPI, GraphQL, Websocket
    • RPC, Serverless, Content Management
    • Web Testing, Web Forms, Markdown
    • Third-party APIs
    • Email, Web Scraping & Crawling, Monitoring
    • Admin UI
    • API Proxies
    • Flask/FastAPI/Pyramid/Django Utilities
  • Nice to see lots of FastAPI projects:
    • fastapi-sqlalchemy - Adds simple SQLAlchemy support to FastAPI.
    • fastapi-plugins - FastAPI framework plugins.
    • fastapi_contrib - Opinionated set of utilities on top of FastAPI.
    • starlette_exporter - Prometheus exporter for Starlette and FastAPI.
    • fastapi-utils - Reusable utilities for FastAPI.
    • fastapi-code-generator - This code generator creates FastAPI app from an..
    • slowapi - A rate limiter for Starlette and FastAPI.
    • fastapi-versioning - api versioning for fastapi web applications.
    • fastapi-react - Cookiecutter Template for FastAPI + React Projects. Using..
    • fastapi_cache - FastAPI simple cache.

Ogi #6: Assorted

  • Pyjion - a JIT extension for CPython that compiles python code using .NET 5 CLR
  • CuPy - NumPy compatible multi-dimensional array on CUDA, uses _``*array_function_* (enabled with numpy 1.17) code using numpy to operate directly on CuPy arrays



  • Trying Firefox + Brave + VPN
  • Python Web Conf 2021 call for talks, due Jan 29, I’ll be speaking!
  • PyCon US 2021 launched call for proposals:
    • December 22, 2020 — Call for proposals opened
    • February 12, 2021 — Proposals are due
    • March 16, 2021 — Notifications will be sent to presenters
    • March 23, 2021 — Deadline for speakers to confirm participation
    • March 30, 2021 — Schedule is publicly released
    • April 28, 2021 — Deadline to submit pre-recorded presentation (tutorials will be live)
    • May 12-13, 2021 — Tutorial days
    • May 15-16, 2021 — Conference days
  • Apple launching Racial Equity and Justice Initiatives with partners across a broad range of industries and backgrounds — from students to teachers, developers to entrepreneurs, and community organizers to justice advocates




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