Code to get and set kMDItemWhereFroms in python

wherefroms.py

# This code is public domain, share and enjoy.
from Foundation import NSPropertyListSerialization
from xattr import setxattr, getxattr

kMDItemWhereFroms = "com.apple.metadata:kMDItemWhereFroms"

def set(path, *data):
  """Set kMDItemWhereFroms on a file. Pass in an array of strings."""
  plist, err = NSPropertyListSerialization.dataWithPropertyList_format_options_error_(data, 200, 0, None)
  if err or not plist:
    return
  setxattr(path, kMDItemWhereFroms, plist)

def get(path):
  """Get kMDItemWhereFroms from a file, returns an array of strings or None if no value is set."""
  try:
    plist = buffer(getxattr(path, kMDItemWhereFroms))
    if plist:
      data = NSPropertyListSerialization.propertyListWithData_options_format_error_(plist, 0, None, None)[0]
      return data
  except KeyError:
    pass
  return None