Re: Re: When is File/Dir.exists?() false?

--- Mark Hahn <[email protected]> wrote: > Mukhsein
Johari wrote:
> > I was reading the File and Dir objects. It's
> pretty
> > nice overall. Just a few questions:
> >
> > As per the subject, when does exists?() return
> False?
> 
> When the actually file or directory the path refers
> to does not exist.
> 
> > When you instantiate the File object, it
> implicitly
> > means it exists, right?
> 
> No.  The File and Dir objects can be created without
> opening files or
> creating directories.  This is different than
> Python.  For a File you leave
> the mode string empty to mean create the object
> without opening the file.
> The Dir constructor never creates a directory.  You
> have to use Dir.make()
> to create a directory.

So...if the file is non-existent, what actually
happens when you do:

myFileObject.read() and write()? close()?

And what about accessing file attributes?

> > I'm just wondering when this
> > would be used.
> 
>     # make sure directory exists before using
>      if not dir.exists?():
>           dir.make()
> 

Once you have instantiated the dir obj, can you change
the path of the dir object?

>      if not dir.exists?():
>           dir.make()

if it gives exception (say you do not have permission
to make that dir) what do you do with the dir object?
Destroy it and make another?

I'm feeling a bit uneasy about file and dir objects
that don't refer to existing files and dirs. I can't
put my finger on why though. It just doesn't seem
useful to me. Could you show a simple use-case?



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