On 25Jan2017 0816, Petr Viktorin wrote:
On 01/25/2017 04:33 PM, Todd wrote:
But what if the .tar.gz file is called "spam-4.2.5-final.tar.gz"?
Existing tools like glob and endswith() can deal with the ".tar.gz"
extension reliably, but "fullsuffix" would, arguably, not give the
answers you want.
I wouldn't use it in that situation. The existing "suffix" and "stem"
properties also only work reliably under certain situations.
Which situations do you mean? It works quite fine with multiple suffixes:
The suffix of "pip-9.0.1.tar.gz" is ".gz", and sure enough, you can
reasonably expect it's a gz-compressed file. If you uncompress it and
strip the extension, you'll end up with a "pip-9.0.1.tar", where the
suffix is ".tar" -- and humans would be surprised if it wasn't a tar
archive.
It may be handy if suffixes was a reversed tuple of suffixes (or
possibly a cumulative tuple):
>>> Path('pip-9.0.1.tar.gz').suffixes
('.gz', '.tar', '.1', '.0')
This has a nice benefit for comparisons:
>>> targzs = [f for f in all_files if f.suffixes[:2] == ('.gz', '.tar')]
It doesn't necessarily improve over .endswith(), but it has a slight
convenience over .split() and arguably demonstrates intent more clearly.
(Though my biggest issue with all of this is case-sensitivity, which
probably means we need to add comparison functions to Path flavours in
order to do this stuff properly.)
The "cumulative tuple" version would be like this:
>>> Path('pip-9.0.1.tar.gz').suffixes
('.gz', '.tar.gz', '.1.tar.gz', '.0.1.tar.gz')
This doesn't compare as nicely, since now we would use f.suffixes[1]
which will raise if there is only one suffix (likely). But it does
return a value which cannot be easily recreated using other functions.
Cheers,
Steve
_______________________________________________
Python-ideas mailing list
Python-ideas@python.org
https://mail.python.org/mailman/listinfo/python-ideas
Code of Conduct: http://python.org/psf/codeofconduct/
