How to execute an external binary reading from standard in

[Markus O Kaukonen]

Dear all,

How to execute a exeternal (binary) program  reading from standard input
in a python code ?
For example :  /home/mok/my_prog.bin < my_input.txt

My system is Linux and the binary is written originally in fortran 90
(if that should matter).

I tried
os.popen('/home/mok/my_prog.bin < my_input.txt ')
with no success

Best Wishes,
Markus Kaukonen, Finnland