Python RV load sequence in defined range

Hi there,
with python i’d like to import a sequence of files to RV in a defined range , not all files in folder.
My idea was to have a List containing all files I do want to load like
‘files’ containing:
[u’c:/temp/070_comp_v019_p.1001.exr’, u’c:/temp/070_comp_v019_p.1002.exr’, u’c:/temp/070_comp_v019_p.1003.exr’]

and then import them by using

but errormessage is :rv.commands.addSource(files)
TypeError: Bad argument (0) to function commands.addSource: expecting string or unicode

This is on RV 6.2.6, for any help to make it work I would be grateful.