nos*_*klo 10
p = subprocess.Popen(['ruby', 'ruby_program.rb'], stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
ruby_question = p.stdout.readline()
answer = calculate_answer(ruby_question)
p.stdin.write(answer)
print p.communicate()[0] # prints further info ruby may show.
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最后两行可以合二为一:
print p.communicate(answer)[0]
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