v1.5.0 - Covariance of Wrapped Types

1.5.0 - 2020-09-23

Added

• Type inference now allows covariance for Result and Option wrapped types
  • Allows a function of type Callable[[int], RuntimeError] to be applied
    via flatmap (.and_then()) to a result of type Result[int, Exception]
  • Allows e.g. any of the following to be assigned to a type of
    Result[Number, Exception]:
    • Result[int, RuntimeError]
    • Result[float, TypeError]
    • etc.
  • This makes .and_then()/.flatmap(), .map(), .map_err(), and so on
    much more convenient to use in result chains.

v1.4.0 - Add new Option.collect() constructor

1.4.0 - 2020-03-09

Added

• New Option.collect constructor to create an Option[Tuple[T, ...]]
  from an iterable of Option[T]. If all Options in the iterator are Some[T],
  they are collected into a tuple in the resulting Some. If any are
  Nothing(), the result is Nothing().

v1.3.1 - Fix pylint `assignment-from-no-return` warning

1.3.1 - 2020-02-21

Fixed

• Fix pylint assignment-from-no-return warnings for methods that can only
  raise, seen when pylint can determine whether a value is an Ok/Err or
  Some/Nothing and you try to e.g. Err(5).expect("no good").

v1.3.0 - Python 3.8 Support, Option.raise_if_nothing()

1.3.0 - 2019-01-12

Added

• Testing in CI for Python 3.8
• Option.raise_if_nothing(self, msg: str, exc_cls: t.Type[Exception] = RuntimeError) -> T
  added as a semantically friendly alias for Option.expect.

Deprecated

• Option.raise_if_err is deprecated in favor of Option.raise_if_nothing.
  Will be removed in 2.0.0

v1.2.0 - raise_if_err() alias for expect()

Added

• Result.raise_if_err(self, msg: str, exc_cls: t.Type[Exception] = RuntimeError) -> T
  added as a semantically friendly alias for Result.expect (thanks @MustardForBreakfast!)
• Option.raise_if_err(self, msg: str, exc_cls: t.Type[Exception] = RuntimeError) -> T
  added as a semantically friendly alias for Option.expect (thanks @MustardForBreakfast!)

v1.1.0 - Result.collect() constructor

1.1.0 - 2019-01-03

Added

• Result.collect(iterable: Iterable[T, E]) -> Result[Tuple[T, ...], E] added
  to collect an iterable of results into a single result, short-circuiting
  if any errors are encountered

v1.0.2 - Include context in expect output

Fixed

• Result.expect() and Result.expect_err() now appends the stringified
  Err or Ok result to the provided msg.

v1.0.1 - Improve Type Hinting

Fixed

• All interface methods now, through the magic of dependent imports, specify
  that they should return implementation instances. This makes working with
  functions specified to return a Result or an Option much easier (1780999)

v1.0.0 - Initial Release

Added

• Result and Option generic type interfaces
• Ok and Err Result implementations
• Some and Nothing Option implementations
• CI pipeline with Azure pipelines
• Full public interface testing
• Makefile for common operations, including venv setup, linting, formatting,
  and testing
• Basic benchmarks for analyzing performance
• Apache license