问题
I have a python script which gets 2 parameters from the command line, an executable and a file. After I do some computation I need to pass by stdin the result of this computation to the executable.
1) is this even possible? 2) if so, how can I do this in Python
回答1:
First, you should never use os.system that's a very dangerous and bad habit.
As for your problem, using subprocess you can do the following:
from subprocess import Popen, PIPE, STDOUT
#do some stuff
data = do_some_computation_from_file
#prepare your executable using subprocess.Popen
exe = Popen(['your_executable'], stdout=PIPE, stdin=PIPE, stderr=STDOUT)
#pass in the computed data to the executable and grap the result
result = exe.communicate(input=data)[0]
来源：https://stackoverflow.com/questions/15775772/python-send-data-to-an-executable-passed-as-parameter-in-terminal