Get attribute names with Python to a column in Excel

I am trying to get attribute names from multiple input MapInfo files into one column in Excel with PythonCaller.

I can get it to print in the Log but it doesn't go out to the Excel reader. Not too sure what the problem is - I use the script below:

import fmeobjects

def processFeature(feature):

pass

class FeatureProcessor(object):

def __init__(self):

pass

def input(self,feature):

feature.removeAttrsWithPrefix('mapinfo_') feature.removeAttrsWithPrefix('fme_') feature.removeAttrsWithPrefix('multi_')

attrNames = feature.getAllAttributeNames()

inputAttrNames = []

for attrname in attrNames: inputAttrNames.append(attrname)

feature.setAttribute('_inputAttrNames', inputAttrNames) self.pyoutput(feature)

def close(self): pass

I have also tried in the for loop -

for attrname in attrNames:

feature.setAttribute('_inputAttrNames', attrname)

Thanks!!