#66: Wait, NoSQL with ACID and transactions?

Sponsored by Rollbar: https://pythonbytes.fm/rollbar

Brian #1: Object-Oriented Programming (OOP) in Python 3

• Real Python
• Nice modern introduction to classes, inheritance, and OOP.
• Classes, objects, attributes, instances, and inheritance.
• One gotcha not mentioned
  • The __init__() method of a base class is not called automatically by derived classes. If you override it, you need to call super().__init__().
• Also, check out attrs for much of our OOP needs

Michael #2: ScriptedForms

• Quickly create live-update GUIs for Python packages using Markdown and a few custom HTML elements.
• Just write in markdown + variables / UI types
• Based on Jupyter

Brian #3: MongoDB to add multi-document transactions and ACID

• Mind blown. Didn’t see this coming
• “MongoDB 4.0 will add support for multi-document transactions, making it the only database to combine the speed, flexibility, and power of the document model with ACID data integrity guarantees. Through snapshot isolation, transactions provide a globally consistent view of data, and enforce all-or-nothing execution to maintain data integrity.”
• Due out this summer.

Michael #4: Python packaging pitfalls

• Just a short list of packaging blunders
  • Forgetting to clean the build dir
  • Forgetting to specify package data
  • Fine grained MANIFEST.in
  • Using package_data, or worse: fine grained package_data
  • Listing excludes/prunes before includes/grafts
  • Hardcoding packages list in setup.py
  • Hardcoding py_modules list in setup.py
  • Importing your package in setup.py
  • Importing unavailable tools in setup.py
  • Messing with the environment
  • Your tests do not test the installed code

Brian #5: Blogging principles

• Julia Evans @b0rk
• Be honest about what you know
• Try not to write anything too long.
  • (My note: don’t shy away from long tutorials. Just don’t only do long stuff)
• Be positive.
• Write for the past you.
• Stick with your own experience.
• It’s ok if not everyone likes it
  • Don’t try to keep one upping yourself.

Michael #6: pipenv is officially official

• Pipenv — the officially recommended Python packaging tool from Python.org, free (as in freedom).
  • Pipenv is a tool that aims to bring the best of all packaging worlds (bundler, composer, npm, cargo, yarn, etc.) to the Python world.
  • Windows is a first–class citizen, in our world.
• Benefits?
  • It automatically creates and manages a virtualenv for your projects
  • adds/removes packages from your Pipfile as you install/uninstall packages
  • generates the ever–important Pipfile.lock, which is used to produce deterministic builds.

Follow up and other news

Brian

• Productive pytest with PyCharm webinar was recorded Thursday 22nd of Feb.
• Will be available here: https://www.jetbrains.com/community/webinars/

Michael:

• Embed Python in Unreal Engine 4 https://github.com/20tab/UnrealEnginePython
• Pandas documentation sprint https://python-sprints.github.io/pandas