Hy (alternately, Hylang) is a programming language, a dialect of the language Lisp designed to interact with the language Python by translating expressions into Python's abstract syntax tree (AST).[1] Hy was introduced at Python Conference (PyCon) 2013 by Paul Tagliamonte.[2]
Similar to Kawa's and Clojure's mapping of s-expressions onto the Java virtual machine (JVM),[3] Hy is meant to operate as a transparent Lisp front end to Python's abstract syntax.[4] Lisp allows operating on code as data (metaprogramming). Thus, Hy can be used to write domain-specific languages.[5] Hy also allows Python libraries, including the standard library, to be imported and accessed alongside Hy code with a compiling[note 1] step converting the data structure of both into Python's AST.[note 2][6][7][8]
From the language documentation:[9]