bash PIPE equivalent in Python

Question

I am converting a bash script into python script. In the bash script there is one section that basically sends mail like

( echo "some_body"
  echo "some header"
 ) | ./sendmail [email protected]

I am trying to convert it like this

from subprocess import Popen, PIPE, STDOUT
p = Popen(['./sendmail', '[email protected]'], stdout=PIPE, stdin=PIPE, stderr=PIPE)
stdout_data = p.communicate(input='data_to_write')[0]

But I am not sure how to pass multiple inputs like in the multiple echo shown in the bash script.

Additional Question:

Apart from this, I have one more question, in the bash scripts there is one command always on top, like

. /opt/../some_necessary_exports.sh
.
.
. other stuff

here some_necessary_exports.sh is like

export SOMETHING="some_thing"
export SOME_OTHER_THING="some_other_thing"
.
.
.

In the python script, I am calling Linux commands using the subprocess module like--

p1 = Popen(['bash', 'some_necessary_exports.sh'], stdout=PIPE, stdin=PIPE, stderr=PIPE)

p2 = Popen(['bash', 'other_command'], stdout=PIPE, stdin=PIPE, stderr=PIPE)

p3 = Popen(['bash', 'other_command'], stdout=PIPE, stdin=PIPE, stderr=PIPE)

I am not sure if these exports will be persisted in other commands. What will be the best way to handle this?

Barmar · Accepted Answer · 2022-08-17 15:41:01Z

1

Simply concatenate the strings you want to send with newline between them.

stdout_data = p.communicate(input=some_header + "\n" + some_body)[0]

answered Aug 17, 2022 at 15:41

Barmar

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1 Comment

Probhakar Sarkar Over a year ago

Thank you, can you provide some suggestions for the second question?

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