[Python-ideas] PEP 428 - object-oriented filesystem paths

[Michele Lacchia]

> > 
> > A reason *not* to use '+' is that it would violate associativity 
> > in some cases, e.g. 
> > 
> >   (path + "foo") + "bar" 
> > 
> > would not be the same as 
> > 
> >   path + ("foo" + "bar") 
> > 
>
>
> I am missing something. Why not? 
>

Because the result would be (respectively): *path/foo/bar* and *path/foobar*
.
In the second example the two strings would be concatenated and only
then joined to the path.
This is a very good argument against the + operator!
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