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30-seconds-of-code/snippets/cast_list.md
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---
title: cast_list
tags: utility,list,beginner
---
Casts the provided value as a list if it's not one.
Use `isinstance()` to check if the given value is enumerable and return it by using `list()` or encapsulated in a list accordingly.
```py
def cast_list(val):
return list(val) if isinstance(val, (tuple, list, set, dict)) else [val]
```
```py
cast_list('foo') # ['foo']
cast_list([1]) # [1]
cast_list(('foo', 'bar')) # ['foo', 'bar']
```