Python Bytes 30

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

• You are not Google
• Enough with microservices

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

• Unleash the Test Army

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.”