Haskell語言特性和標準庫的純Python實現：Hask

Hask是一個純Python，零依賴庫模仿了來自Haskell大部分語言核心語言工具，包括：

• Full Hindley-Milner type system (with typeclasses) that will typecheck any function decorated with a Hask type signature
• Easy creation of new algebraic data types and new typeclasses, with Haskell-like syntax
• Pattern matching withcaseexpressions
• Automagical function currying/partial application and function composition
• Efficient, immutable, lazily evaluatedListtype with Haskell-style list comprehensions
• All your favorite syntax and control flow tools, including operator sections, monadic error handling, guards, and more
• Python port of (some of) the standard libraries from Haskell'sbase, including:
  • Algebraic datatypes from the HaskellPrelude, includingMaybeandEither
  • Typeclasses from the Haskellbaselibraries, includingFunctor,Applicative,Monad,Enum,Num, and all the rest
  • Standard library functions frombase, including all functions fromPrelude,Data.List,Data.Maybe, and more

Features not yet implemented, but coming soon:

• Python 3 compatibility
• Better support for polymorphic return values/type defaulting
• Better support for lazy evaluation (beyond just theListtype and pattern matching)
• More of the Haskell standard library (Control.*libraries, QuickCheck, and more)
• Monadic, lazy I/O

Note that all of this is still very much pre-alpha, and some things may be buggy!

Installation

1)git clone https://github.com/billpmurphy/hask

2)python setup.py install

To run the tests:python tests.py.

項目主頁：http://www.baiduhome.net/lib/view/home/1438309255316