sorting a file

[Romualdo]

Hello,

I am trying to rewrite a little shell script into python.
I ve got a text file with following content:

foo bar file_name1.ext ./foobar
foo bar file_name2.ext ./foobar
...
..
.


Now the shell script reads only the "file_nameXX.ext"-part and using
it as a variable, the script moves the file "file_nameXX.ext" from a
directory to another directory given. It looks like this:

source_dir = /foo/bar
dest_dir = /another/foo/bar
sourcefile = "source_dir" + "/" + "file_name"
destfile = "dest_dir" + "/" + "file_name"
PROGRAM = move sourcefile destfile

Does anybody could tell me how the lines above would look like in
python?
Thank you for helping me out.

Best regards,
Michel