62 lines
1.5 KiB
Org Mode
62 lines
1.5 KiB
Org Mode
:PROPERTIES:
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:ID: 295a5f40-5639-45e0-b277-8b5aecee600c
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:END:
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#+title: Hy
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A lisp dialect of Python.
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* Example
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#+name: dataclass
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#+begin_src hy :exports code :eval never
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(import [dataclasses [dataclass])
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(with-decorator dataclass
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(defclass Thing []
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(^str name)
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(^int age)))
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#+end_src
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Disassembling the above code generates the following Python equivalent.
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#+begin_src hy :exports results :cache yes :wrap src python
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(disassemble
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(quote
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(do
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(import [dataclasses [dataclass]])
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(with-decorator dataclass
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(defclass Thing []
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(^str description)
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(^int value)))))
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True)
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#+end_src
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#+RESULTS[08e5153ad26dcf0fd8ca2a7c041eb26268461381]:
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#+begin_src python
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from dataclasses import dataclass
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@dataclass
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class Thing:
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description: str
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value: int
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#+end_src
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* Annotations
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Supports [[id:5cb1f706-0162-4e6d-9cd8-dc6af3ae68cc][Python Typing]] annotations via the special form =^=:
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#+begin_src hy :exports code :eval never
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; Annotate the variable x as an int (equivalent to `x: int`).
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(^int x)
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; Can annotate with expressions if needed (equivalent to `y: f(x)`).
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(^(f x) y)
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; Annotations with an assignment: each annotation (int, str) covers the term that
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; immediately follows.
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; Equivalent to: x: int = 1; y = 2; z: str = 3
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(setv ^int x 1 y 2 ^str z 3)
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; Annotate a as an int, c as an int, and b as a str.
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; Equivalent to: def func(a: int, b: str = None, c: int = 1): ...
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(defn func [^int a ^str [b None] ^int [c 1]] ...)
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#+end_src
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