如何将此Shell脚本转换为python？

Question

I'd like to translate the shell code below to python code.
subprocess.Popen is used for doing it?
I've tried it, but I don't understand how to give (1),(2) commands.

sh> cat a.sh
dc << EOF
  20 5 / p    --(1)
  10 4 * p    --(2)
EOF
sh> sh a.sh
4
40

dc is just an example program for asking a question.
This can be replaced with any program which acts like this.
python version is 2.7.6. (Maybe sh module is not included in this version so it seems I can't use sh.Command)

Answer 1

Thanks.

>>> from subprocess import Popen,PIPE,STDOUT
>>> p = Popen(['dc'], stdout=PIPE, stdin=PIPE, stderr=STDOUT)
>>> output = p.communicate(input=b'20 5 / p\n10 4 * p')[0]
>>> print(output.decode())
4
40