#83 from __future__ import braces

Sponsored by DigitalOcean: pythonbytes.fm/digitalocean

Special guest: Cristian Medina, @tryexceptpass

Brian #1: Code with Mu: a simple Python editor for beginner programmers.

• Found out about this from Nicholas Tollervey (@ntoll)
• Built by an impressive list of people: https://codewith.mu/en/ thanks
• Beginning code editor that also works with Adafruit and micro:bit boards.
• From about:
  • Less is More.
    • Mu has only the most essential features, so users are not intimidated by a baffling interface.
  • Tread the Path of Least Resistance.
    • Whatever the task, there is always only one obvious way to do it with Mu.
  • Keep it Simple.
    • It's quick and easy to learn Mu ~ complexity impedes a novice programmer's first steps.
  • Have fun!
    • Learning should inspire fun ~ Mu helps learners quickly create and test working code.

Cris #2: Python parenthesis primer

• Good for beginners. Covers the main uses of parenthesis, curly brackets and square brackets. Including code examples.
• Parenthesis
  • Callables.
  • Operation prioritization.
  • Tuples.
  • Generator expressions.
  • Skirting the indentation rules.
• Square brackets
  • Lists and their comprehensions.
  • Indexing.
  • Slices.
  • Comments also mention type hints.
• Curly braces
  • Dictionaries and comprehensions.
  • Sets and comprehensions.
  • F-strings.
  • str.format.
• Try to import braces from __future__:

    >>> from __future__ import braces
      File "[HTML_REMOVED]", line 1
    SyntaxError: not a chance

Michael #3: Python for Qt Released

• The Qt Company happy to announce the first official release of Qt for Python (Pyside2).
• v5.11
• We hope we can receive plenty of feedback on what works and what does not. We want to patch early and often.
• Eventually the aim is to release Qt for Python 5.12 without the Tech Preview flag.
• Started two years ago with this announcement from Lars.
• Get Qt for Python: The release supports Python 2.7, 3.5 & 3.6 on the three main desktop platforms. The packages can be obtained from download.qt.io or using pip with
• pip install --index-url=https://download.qt.io/official_releases/QtForPython/ pyside2

Brian #4: Itertools in Python 3, By Example

• by David Amos (@somacdivad)
• Iterators and generators are awesome.
• Nice discussion of lazy evaluation and iterator algebra.
• Naive approach using list can blow up in memory and time if you use huge datasets.
• Examples:
  • combinations, combinations_with_replacement, permutations
  • count, repeat, cycle, accumulate
  • product, tee, islice, chain
  • filterfalse, takewhile, dropwhile

Cris #5: Python Sets and Set Theory

• Nice primer on sets in python and a little set theory.
• How to build them: set() vs {``'``value1``'``, '``value2``'``} vs {name for name in name_list}
• Membership tests (which are O(1))
• Set operations
  • Union
  • Intersection
  • Difference
  • Symmetric Difference
• Frozen sets

Michael #6: Python 3.7 is coming soon!

• Schedule
  • 3.7.0 candidate 1: 2018-06-12
  • 3.7.0 final: 2018-06-27
• What’s new / changed?
  • New syntax features: PEP 563, postponed evaluation of type annotations.
  • New modules: dataclasses: PEP 557 – Data Classes
  • New built-in features: PEP 553, the new breakpoint() function.
  • Standard lib changes:
    • The asyncio module has received new features, significant usability and performance improvements.
    • The time module gained support for functions with nanosecond resolution.
  • Speed:
    • Method calls are 20% faster
    • 3.7 is THE fastest Python available, period.
• What’s new in Python 3.7 course by Anthony Shaw

Our news

• ahem… https://www.mongodb.com/presentation/building-python-web-apps