Episode #30: You are not Google and other ruminations

Published Thurs, Jun 15, 2017, recorded Wed, Jun 14, 2017.

Python Bytes 30

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Brian #1: Problems and Solutions are different at different scales

Michael #2: Introducing NoDB - a Pythonic Object Store for S3

  • Released in April 2017 by Rich Jones
  • An incredibly simple, Pythonic object store based on Amazon's S3 static file storage.
  • NoDB isn't a database.. but it sort of looks like one!
  • Kind of like a document database, supports indexing
  • Can use Pickling or JSON
  • Mostly useful for prototyping, casual hacking, and (maybe) even low-traffic server-less databases for Zappa apps!
  • Can see a few use cases for NoDB:
    • Prototyping schemas
    • Storing API event responses for later replay
    • Capturing event logs
    • Storing simple form data (email addresses, etc.)
    • Storing non-relational analytics data
    • Firing Lambda event triggers
    • Version controlling evolving Python objects
    • Storing and loading trained machine learning models
  • https://github.com/Miserlou/NoDB

Brian #3: Elizabeth for mock data Part 1: https://medium.com/wemake-services/generating-mock-data-using-elizabeth-part-i-ca5a55b8027c Part 2: https://medium.com/wemake-services/generating-mock-data-with-elizabeth-part-ii-bb16a3f3106f pytest plugin: https://github.com/lk-geimfari/pytest-elizabeth

Michael #4: What’s New In Python 3.7

  • Lang: More than 255 arguments can now be passed to a function, and a function can now have more than 255 parameters.
  • Lang: bytes.fromhex() and bytearray.fromhex() now ignore all ASCII whitespace, not only spaces.
  • Lang: Circular imports involving absolute imports with binding a submodule to a name are now supported.
  • Module: contextlib.asynccontextmanager() has been added.
    • Similar to contextmanager(), but creates an asynchronous context manager.
    • This function is a decorator that can be used to define a factory function for async with statement asynchronous context managers, without needing to create a class or separate __aenter__() and __aexit__() methods.
  • Module:The dis() function now is able to disassemble nested code objects (the code of comprehensions, generator expressions and nested functions, and the code used for building nested classes).
  • Module: math: New remainder() function, implementing the IEEE 754-style remainder operation.
  • Optimization: Added two new opcodes: LOAD_METHOD and CALL_METHOD to avoid instantiation of bound method objects for method calls, which results in method calls being faster up to 20%.
  • Optimization: The os.fwalk() function has been sped up by 2 times.

Brian #5: Hypothesis Testing

Michael #6: Heroku switching default to v3.6.1

  • Effective Tuesday, June 20th, 2017, new Python applications pushed to Heroku will use the python-3.6.1 runtime by default (instead of python-2.7.13).
  • Existing applications will not be affected by this change.
  • “Lots of new projects start out on heroku all the time, so this is really great news for python 3 adoption.”
  • “Python 3 is really happening. I was actually a little worried about the future of Python for a while.”

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