[Python-Dev] Add os.path.resolve to simplify the use of os.readlink

Thu Jun 21 12:23:25 CEST 2012

Due to an user error on my part I was not using os.readlink correctly. 
Since links can be relative to their location I think it would make sense
to provide an os.path.resolve helper that automatically returns the
absolute path:
 def resolve(filename):
 try:
 target = os.readlink(filename)
 except OSError as e:
 if e.errno == errno.EINVAL:
 return abspath(filename)
 raise
 return normpath(join(dirname(filename), target))
The above implementation also does not fail if an entity exists but is not
a link and just returns the absolute path of the given filename in that
case.
Regards,
Armin