piping into a python script

[Donn Ingle]

Hi,
(Gnu/Linux - Python 2.4/5)
Given these two examples:
1. 
./fui.py *.py
2.
ls *.py | ./fui.py

How can I capture a list of the arguments?
I need to get all the strings (file or dir names) passed via the normal
command line and any that may come from a pipe.

There is a third case:
3.
ls *.jpg | ./fui.py *.png
Where I would be gathering strings from two places.

I am trying to write a command-line friendly tool that can be used in
traditional gnu/linux ways, otherwise I'd skip the pipe stuff totally.

I have tried:
1. pipedIn = sys.stdin.readlines()
Works fine for example 2, but example 1 goes into a 'wait for input' mode
and that's no good. Is there a way to tell when no input is coming from a
pipe at all?

2. import fileinput
for line in fileinput.input():
    print (line)
But this opens each file and I don't want that. 


I have seen a lot of search results that don't quite answer this angle of
the question, so I'm trying on the list.

\d