[Python-ideas] Re: len(path) == len(str(path))

[Steven D'Aprano]

On Sun, May 24, 2020 at 02:27:00PM +0300, Ram Rachum wrote:

> Today I wrote a script and did this:
> 
>     sorted(paths, key=lambda path: len(str(path)), reverse=True)
> 
> But it would have been nicer if I could do this:
> 
>     sorted(paths, key=len, reverse=True)

It would have been even nicer if we could compose functions:

    sorted(paths, key=len∘str, reverse=True)

*semi-wink*


> So I implemented `PurePath.__len__` as `str(len(path))`.
> 
> Serhiy and Remi objected, because it might not be obvious that the length
> of the path would be the length of string.

It isn't obvious to me that the length of a path is the length of the 
string representation of that path.

I thought that the length of the path would be the number of path 
components:

    /tmp/file  # length 2

I wouldn't have predicted that was the length of the string 
representation of the path.


-- 
Steven
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