How to use the changelog.changelog function in changelog

def __init__(self, opener, version):
        appendopener.__init__(self, opener)
        changelog.changelog.__init__(self, self, version)
    def checkinlinesize(self, fp, tr):

for chunk in util.filechunkiter(ifp):
                ofp.write(chunk)
            ifp.close()
            os.unlink(tmpname)
            del self.tmpnames[name]
            ofp.close()

    def cleanup(self):
        '''delete temp files (this discards unwritten data!)'''
        for tmpname in self.tmpnames.values():
            os.unlink(tmpname)

# files for changelog and manifest are in different appendopeners, so
# not mixed up together.

class appendchangelog(changelog.changelog, appendopener):
    def __init__(self, opener, version):
        appendopener.__init__(self, opener)
        changelog.changelog.__init__(self, self, version)
    def checkinlinesize(self, fp, tr):
        return

class appendmanifest(manifest.manifest, appendopener):
    def __init__(self, opener, version):
        appendopener.__init__(self, opener)
        manifest.manifest.__init__(self, self, version)
    def checkinlinesize(self, fp, tr):
        return