[PYTHONMAC-SIG] Mac open()

[Guido van Rossum]

> This is really bugging me.
> On my mac, I can't seem to use the open() function for
> files in subfolders. I'm using the right separator etc.
> But it insists on failing to find the file.  I'm using
> the 1.3 PowerPC version.  Any idea's?  This may relate
> to the faulty rename builtin function.
> 
> >>> s = open('data:DoI.txt')
> Traceback (innermost last):
>   File "<stdin>", line 1, in ?
> IOError: (-43, 'File not found')
> >>> os.listdir('data')
> ['DoI.txt', 'parrot']
> >>> f = open('data:a','w')
> Traceback (innermost last):
>   File "<stdin>", line 1, in ?
> IOError: (-43, 'File not found')

I bet it's the Mac pathname syntax.  If a pathname contains a colon,
it's *relative* when it starts with a colon, it's *absolute* when
it doesn't (when it contains no colon at all, it's always relative).

A pathname of the form HD:dir:subdir:file is an absolute pathname,
on volume "HD", folder "dir", subfilder "subdir", file "file".

A pathname of the form ":subdir:file" is a relative pathname,
in the current directory, subdirectory "subdir", file "file".

--Guido van Rossum

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