[Tutor] Using type

[ALAN GAULD]

> It'll work on lists and tuples, for simple examples.  But beware that 
> when you iterate through strings, the individual characters are also 
> strings, and this function will fail with an error like:
>    RuntimeError: maximum recursion depth exceeded

Oh, good catch Dave.

So you'd want to add an explicit check for a string.
And in  fact you probably don't want to "flatten" a string into 
individual characters anyway!

Alan G.
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