tspart.py does not pull in file correctly from other directories

[tmulry]

I am getting a stack trace error when using tspart.pt on a file in a different directory.
e.g. $python tsp_art_tools/trunk/tspart.py Pictures/Gocupi/cascadebmpindex.pbm

Expected this to work OK with relative paths. Suggest updating code to set "infile" and "outfile" as absolute paths before working with them.

Script runs fine when python is invoked from the same dir as the input file.

Here is the full Trace.
Traceback (most recent call last):
File "tsp_art_tools/trunk/tspart.py", line 243, in
tsp_fd, tspfile = tempfile.mkstemp( suffix='.tsp', prefix=tmp_prefix, text=True )
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 304, in mkstemp
return _mkstemp_inner(dir, prefix, suffix, flags)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 239, in _mkstemp_inner
fd = _os.open(file, flags, 0600)
OSError: [Errno 2] No such file or directory: '/var/folders/dm/ll6_b6xx2b56sygrlzdw2vb40000gn/T/Pictures/Gocupi/cascadebmpindex.wFpjtz.tsp'