human
Solve the following python programming problem given the following code:
def _create_property(field_name, docstring, read_only = False, closed_only = False) : 
    'Helper for creating properties to read/write to files.
    ' 
    def getter(self) : 
        if (closed_only and (not self._closed)) : 
            raise AttributeError (('can only get %r on a closed file' % field_name)) 
if (field_name == 'length') : 
            return self._file.get (field_name, 0) 
return self._file.get (field_name, None) 
def setter(self, value) : 
        if self._closed : 
            self._coll.files.update ({ 
                '_id' : self._file ['_id'], 
}, { 
                '$set' : { 
                    field_name : value, 
}, 
}, ** self._coll._get_wc_override ()) 
self._file [field_name] = value 
if read_only : 
        docstring = (docstring + '

This attribute is read-only.') 
else : 
        if closed_only : 
            docstring = ('%s

%s' % (docstring, 'This attribute is read-only and can only be read after :meth:`close` has been called.')) 
if ((not read_only) and (not closed_only)) : 
        return property (getter, setter, doc = docstring) 
return property (getter, doc = field_name) 

    
    

    Fix the buggy line: return property (getter, doc = field_name)
assistant
#Here is Python program to fix the buggy line: return property (getter, doc = field_name)
.

return property (getter, doc = docstring)