Hy

Hy
Cuddles the cuttlefish
Paradigm Multi-paradigm: procedural, functional, object-oriented, meta, reflective, generic
Family Lisp
Designed by Paul Tagliamonte
First appeared 2013
Preview release
0.14.0 - Feb 14, 2018
Scope lexical, optionally dynamic
OS Cross-platform
Filename extensions .hy
Website hylang.org

Hy (alternately, Hylang) is a dialect of the Lisp programming language designed to interact with Python by translating expressions into Python's abstract syntax tree (AST). Hy was introduced at PyCon 2013 by Paul Tagliamonte.[1]

Similar to Clojure's and Kawa's mapping of s-expressions onto the JVM,[2] Hy is meant to operate as a transparent Lisp front end to Python's abstract syntax.[3] Because Lisp allows operating on code as data, Hy can be used to write domain-specific languages.[4] Hy also allows Python libraries (including the standard library) to be imported and accessed alongside Hy code with a compilation[note 1] step converting the data structure of both into Python's AST.[note 2][5][6][7]

Example code

From the language documentation:[8]

=> (print "Hy!")
Hy!
=> (defn salutationsnm [name] (print (+ "Hy " name "!")))
=> (salutationsnm "YourName")
Hy YourName!

See also

Notes

  1. ↑ "Compiled" is a term which may apply to expressing Hy code in Python's AST or converting that AST into bytecode, the latter being dependent on the particular Python interpreter used and not Hy.
  2. ↑ Hy is tested on Python 2.7, 3.4 through 3.6, and PyPy.

References

  1. ↑ Paul Tagliamonte (2 April 2013). PyCon lightning talk (Speech). PyCon. Santa Clara. Retrieved 2 September 2014.
  2. ↑ Turto, Tuukka (14 February 2014). "Programming Can Be Fun with Hy". Open Source For You. Retrieved 2 September 2014.
  3. ↑ Edge, Jake (30 April 2014). "Getting Hy on Python". LWN.net. Retrieved 2 September 2014.
  4. ↑ Paul Tagliamonte (11 April 2014). Getting Hy on Python: How to implement a Lisp front-end to Python (Speech). PyCon. Montreal. Retrieved 2 September 2014.
  5. ↑ "Hy Documentation". hylang.org. Retrieved 3 September 2014.
  6. ↑ Danjou, Julien (26 March 2014). "The AST". The Hacker's Guide to Python. pp. 165–172.
  7. ↑ Kitchin, John (31 March 2016). "More on Hy and why I think it is a big deal". The Kitchin Research Group. Carnegie Mellon University. Retrieved 19 September 2018.
  8. ↑ "Quickstart". hylang.org. 15 May 2018. Retrieved 19 September 2018.
Timeline of Lisp dialects(edit)
1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2018
Lisp 1.5 Lisp 1.5
Maclisp Maclisp
Interlisp Interlisp
ZetaLisp Lisp Machine Lisp
Scheme Scheme
NIL NIL
Common Lisp Common Lisp
LeLisp Le_Lisp
T T
Emacs Lisp Emacs Lisp
AutoLISP AutoLISP
OpenLisp OpenLisp
PicoLisp PicoLisp
EuLisp EuLisp
ISLISP ISLISP
newLISP newLISP
Racket Racket
Guile GNU Guile
Visual LISP Visual LISP
Clojure Clojure
Arc Arc
LFE LFE
Hy Hy
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