NSAttributedString returns a tuple, not an NSAttributedString

Hello -  I am trying PyObjC for the first time and I discovered something that I don't understand.  If I initialize an NSAttributedString like this:

content = NSAttributedString.alloc().initWithPath_documentAttributes_(a_path, None)

Then content contains a tuple, not an NSAttributedString.  If I initialize is like this:

content = NSAttributedString.alloc()
a_tuple = content.initWithPath_documentAttributes_(a_path, None)

Then content contains an attributed string from the contents of the file, and a_tuple contains a tuple.  On the other hand NSAttributedString.alloc().init()
returns an instance of NSAttributedString, as expected.  So, apparently initWithPath_documentAttributes_() returns a tuple instead of an instance of NSAttributedString.  My question is, is this by design (and thus, there is something about PyObjC that I don't understand) or is it a bug? 


Thanks
Mike
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