---
name: flatten
kind: function
lang: py
domain: core
version: "1.0.0"
purity: pure
signature: "def flatten(xss: list) -> list"
description: "Aplana una lista de listas un nivel, concatenando las sublistas."
tags: [list, functional, flatten, python, pendiente-usar]
uses_functions: []
uses_types: []
returns: []
returns_optional: false
error_type: ""
imports: []
params:
  - name: xss
    desc: "lista de listas a aplanar"
output: "lista plana con todos los elementos concatenados un nivel"
tested: false
tests: []
test_file_path: ""
file_path: "python/functions/core/core.py"
---

## Ejemplo

```python
result = flatten([[1, 2], [3], [4, 5]])
# [1, 2, 3, 4, 5]
```

## Notas

Funcion pura. Solo aplana un nivel de anidamiento.