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

[Stephen J. Turnbull]

Ethan Furman writes:
 > Eric Snow wrote:
 > > On Fri, Oct 5, 2012 at 5:48 PM, Antoine Pitrou <solipsis at pitrou.net> wrote:
 > >> On Fri, 05 Oct 2012 14:38:57 -0700
 > >> Ethan Furman <ethan at stoneleaf.us> wrote:
 > >>> Say I have a .dbf table as PureNTPath('c:\orders\12345\abc67890.dbf'),
 > >>> and I export it to .csv in the same folder; how would I transform the
 > >>> above PureNTPath's ext from 'dbf' to 'csv'?
 > >> Something like:
 > >>
 > >>>>> p = PureNTPath('c:/orders/12345/abc67890.dbf')
 > >>>>> p.parent()[p.name.split('.')[0] + '.csv']
 > >> PureNTPath('c:\\orders\\12345\\abc67890.csv')
 > >>
 > >> Any suggestion to ease this use case a bit?
 > > 
 > > Each namedtuple has a _replace() method that's is used to generate a
 > > new instance with one or more attributes changed.  We could do
 > > something similar here:
 > > 
 > >>>> p = PureNTPath('c:/orders/12345/abc67890.dbf')
 > >>>> p.replace(ext='.csv')
 > > PureNTPath('c:\\orders\\12345\\abc67890.csv')
 > 
 > +1

How about a more general subst() method?  Indeed, it would need
keyword arguments for named components like ext, but I often do things
like "mv ~/Maildir/{tmp,new}/42" in the shell.  I think it would be
useful to be able to replace any component of a path.