Python script reading from sys.stdin and debugger

[Fillmore]

Hello PyMasters!

Long story short:

cat myfile.txt | python -m pdb myscript.py

doens't work (pdb hijacking stdin?).

Google indicates that someone has fixed this with named pipes, but, call 
me stupid, I don't understand how I need to set up those pipes, how I 
need to modify my script and, above all, how I now need to invoke the 
program.

Help and suggestions appreciated. I am using Python 3.4 on Cygwin and 
Ubuntu.

Thanks