+++
title = 2025-01-06
author = ["SouthFox"]
date = 2025-01-06T23:33:00+08:00
lastmod = 2025-01-06T23:45:53+08:00
tags = ["publish"]
draft = false
+++

## Hy {#hy}

[API reference — Hy 1.0.0 manual](https://hylang.org/hy/doc/v1.0.0/api#for)

[hy]({{< relref "../main/20250106234212-hy.md" >}}) 里 `for` 里能引用之前的标识符，达到 `python` 里用多个 `for` 循环能表达同样的效果。

```hy
(for [[root dirs files] (os.walk "source")
       -file files]
    (let [file (os.path.join root -file)]
      (when (and (in "posts" file) (file.endswith ".md"))
        (markdown-files.append file))))
```