input-external program-output

[baolevani]

Hi All,
How can I call an external program in python, feed .txt file and retrieve the output.
Thanks!

[Larz60+]

Could you please elaborate, this is not a very detailed description of what you'd like to do

[nilamo]

1) subprocess module
2)

with open("somefile.txt") as fin:
    for line in fin:
        print(line.swapcase())