Hy (lisp)

最新推荐文章于 2025-03-27 23:23:43 发布

JhonXie

最新推荐文章于 2025-03-27 23:23:43 发布

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文章标签： python

原文链接：https://juejin.im/post/5c4f04c8e51d4551c8805ef2

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本文从1958年的Lisp语言出发，介绍了一种现代的、能够与Python交互的语言Hy。Hy通过将表达式转换为Python的抽象语法树（AST），实现了与Python的无缝对接。文章深入探讨了Lisp的基本构建块，包括原子、列表、字符串等概念，并讲解了宏定义、变量声明和数据类型等关键特性。

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1958 (Lisp) -> 2020 (Hy)

Hy designed to interact with Python by translating expressions into Python's abstract syntax tree (AST)

(write-line "Hello World")
(write (+ 7 9 11))   # 7 + 9 + 11
(write (+ (* (/ 9 5) 60) 32))  # ((9/5)*60)+32
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basic building blocks

atom: numbers and special characters

123008907  abc123
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list: a sequence of atoms and/or other lists enclosed in parentheses

(a ( a b c) d e fgh)
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string: a group of characters enclosed in double quotation marks

" I am a string"
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semicolon symbol (;) is used for indicating a comment line case-insensitive three types of elements are constants and always return their own value Numbers; letter t, logical true; value nil, logical false, empty list

data types can be categorized as

Scalar types - for example, number types, characters, symbols etc
Data structures - for example, lists, vectors, bit-vectors, and strings
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macro is a function

(defmacro setTo10(num)
(setq num 10)(print num))
(setq x 25)
(print x)
(setTo10 x)
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Global variables are generally declared using the defvar construct.

(defvar x 234)
(write x)
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let and prog for creating local variables.

(prog ((x '(a b c))(y '(1 2 3))(z '(p q 10)))
(format t "x = ~a y = ~a z = ~a" x y z))  # x = (A B C) y = (1 2 3) z = (P Q 10)
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转载于:https://juejin.im/post/5c4f04c8e51d4551c8805ef2