[Zope] file attributes

[John Hunter]

I am using a form to upload a file object:

<tr><th>EEG File</th>
	<td><INPUT TYPE="file" NAME="file_name" WIDTH=60></td></tr>

When the form is submitted, the REQUEST object file_name is passed to
a Python Script which adds it to the file system:

  folder.manage_addFile(id='', file=file_name)
  return getattr(file_name, 'filename')

This works fine.  

My question is on the getattr part.  I got code from some example,
long lost to me now, and can grok how it works, but I am having
trouble finding suitable documentation.  For example, what are the
other attributes of file_name besides 'filename'.  I tried '__dict__'
to get a listing but got an error, so I suspect this is one of the
protections of the Zope 'getattr'.

Could someone point me to some reference documentation that would have
this?  

Thanks,
John Hunter