# Chapter 5 Exercise Set 4: Recursion Exercises¶

## Counting the length of sequences by traversal revisited¶

In Counting the length of sequences by traversal you were asked to traverse a sequence and print out the length of each element. In this exercise you will improve on that solution by:

Handle cases where the element is an

`int`

or`float`

and print`None`

for length.Recursively print out the length of all elements which are

*nested sequences*.

```
['spam!', 1, ['Brie', 'Roquefort', 'Pol le Veq'], [1, 2, 3]]
```