length of a tuple or a list containing only one element

[TP]

Hi everybody,

I have a question about the difference of behavior of "len" when applied on
tuples or on lists. I mean:

$ len( ( 'foo', 'bar' ) )
2
$ len( ( 'foo' ) )
3
$ len( [ 'foo', 'bar' ] )
2
$ len( [ 'foo' ] )
1

Why this behavior for the length computation of a tuple?
For my application, I prefer the behavior of length for a list. If I want to
store some values in a tuple because they should not be modified, the case
where the tuple contains only one element bothers me.

Thanks

Julien
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