What previous process?

Did you try using:

Code:

python test.py < keywords

like I suggested in post #2? If so, did it work? If not, in what way did it fail?

If the above works and you have some other process that is creating the contents of the file named keywords, then piping the output of that command directly into python test.py is highly likely to work if that process writes the data that is stored into keywords to its standard output.

With very few exceptions, if the command sequence:

Code:

producer > temp_file
consumer < temp_file

works, then those two commands be replaced by:

Code:

producer | consumer

and get the same results. Or, if you need to keep the data that is being passed between producer and consumer, you can use:

Code:

producer | tee temp_file | consumer

and often still get faster results that running the two processes synchronously.