Coconut v2.2.0

See Coconut's documentation for more information on all of the features listed below.

Major changes:

• #694: New multiset built-in based on collections.Counter, including new multiset literal syntax (m{1, 1, 2, 3, 3, 4}).
• #691: New Expected built-in based on Haskell's Either, plus new safe_call built-in that calls a function while collecting any errors into an Expected. Additionally, the of built-in has been renamed to call (of is still available as a deprecated alias when compiled without --strict).
• #701: New windowsof built-in for iterating over sliding windows of the given iterable.
• #688: New cartesian_product built-in as an enhanced version of itertools.product including numpy support.
• #690: New cycle built-in as an enhanced version of itertools.cycle.
• #704, #703, #702, #693, #692: Lots of improvements to existing built-ins:
  • map now supports a strict=True keyword-only argument that works as in zip.
  • flatten now supports a levels argument for how many levels to flatten.
  • groupsof now supports a fillvalue argument to pad the last group.
  • addpattern now accepts any number of pattern-matching functions.
  • memoize now accepts a function to memoize as the first argument.
• #710: New None-aware function composition pipes (e.g. f ..?> g).

Minor changes:

• #686: Type parameter bounds can (and should) now use <: syntax instead of : or <= (e.g. def f[T <: int[])(xs: T) -> T = ...).
• #711: Backwards None-aware pipes now supported (e.g. <?|).
• #708: Pattern-matching against data types with default arguments now allows those defaults to be elided in the match.
• #697: :: now produces a reiterable object when called on reiterable objects.
• #706: Multiple Coconut projects should now be able to seamlessly use each other's MatchErrors when compiled in --package mode.
• #695: Set literal syntax now supports star unpacking.
• #699: Support for __bool__ magic method fixed on Python 2.
• #687: Jupyter kernel and other automatic compilations now uses --no-wrap.
• #685, #684: Improved detection of code issues on and off --strict.
• #700: Some confusing unicode alternatives were removed.
• #698: Typing for fmap has been improved.
• #689: Improved numpy support for some built-ins.
• #705: Many Coconut built-ins have now been made weakrefable.