start a python script with input redirection in emacs

[Leo]

hi all

i use python-mode and want to start a python script which uses data from the
standard input via "input".

this script works fine from the command line but in emacs via
py-execute-buffer i get always an python execution error.

additionally i want to start the script with input redirection to a file.
that as well works fine via command line, but i have no idea how to tell
emacs to execute the script with input redirection.

thanks for any help,

leo