Is it just me or are the method names of this module really not helfpul? I had to loop spew in the dictionary because I wasn't sure of the implication, I knew of "spewing nonsense" but I didn't realize the word had such a negative connotation to it. And somehow I would understand spew to be the reverse action (getting data out of a file, not in). And I got what sibling does because I knew what to expect. Beyond that I guess it is a pretty short and "clean" (except for the confusing names) way to do what I want.
Also, here your code works because each file contains its own name, but I think it should be path(shift), without the -n option