Comment 5 for bug 955106

Re: your question
    Why do these lists differ so mach? How is it possible?

I cannot answer without seeing your python script.

Meanwhile -- if you add -vv -- RPM is heavily instrumented
with debugging messages, and so most questions involved
in developing with python bindings can be answered by
comparing behaviors with the RPM command line and checking
what is different.

Turn on -vv (or other debugging) and examine the differences in output.