How to launch an EDITOR (e. g. vim) from a python script?

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Calling up $EDITOR is easy. I’ve written this kind of code to call up editor:

import sys, tempfile, os
from subprocess import call

EDITOR = os.environ.get('EDITOR', 'vim')  # that easy!

initial_message=""  # if you want to set up the file somehow

with tempfile.NamedTemporaryFile(suffix=".tmp") as tf:
  tf.write(initial_message)
  tf.flush()
  call([EDITOR, tf.name])

  # do the parsing with `tf` using regular File operations.
  # for instance:
  tf.seek(0)
  edited_message = tf.read()

The good thing here is the libraries handle creating and removing the temporary file.

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