Pops up your $EDITOR and returns the content entered. Similar to 'git commit -a'

edit.py

def edit_dialog(**kwargs):
    EDITOR = os.environ.get("EDITOR", "vim")
    with tempfile.NamedTemporaryFile(suffix=".tmp") as tmp:
        if 'prefill' in kwargs:
            tmp.write(kwargs.get('prefill'))
            tmp.flush()
        subprocess.call([EDITOR, tmp.name])

        output = ""  
        with open(tmp.name) as message:
            for line in message:
                if not line.startswith ('#'):
                    output += line

        if not output.strip():
            return "\n\n\tERROR: Edit aborted by user!\n\n"
                                                                                                                                                                                              
    return output