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I've got an interactive program called my_own_exe . First, it prints out alive , then you input S\n and then it prints out alive again. Finally you input L\n . It does some processing and exits. However, when I call it from the following python script, the program seemed to hang after printing out the first 'alive'. Can anyone here tell me why this is happening? // after reading the follow ups (thank you guys), i modified the code as following: import subprocess import time base_command = "./AO_FelixStrategy_UnitTest --bats 31441 --chix 12467 --enxutp 31884 --turq 26372 --symbol SOGN --target_date " + '2009-Oct-16' print base_command proc2 = subprocess.Popen(base_command, shell=True , stdin=subprocess.PIPE,) time.sleep(2); print "aliv" proc2.communicate('S\n') print "alive" time.sleep(6) print "alive" print proc2.communicate('L\n') time.sleep(6) the program now goes well with the first input 'S\n', but then stopped, and I the second 'L\n' is kinda ignored. Can anyone give me an idea why it's like this?

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