Decode email format (MIME quoted printable)

email-raw-decode.py

from email.parser import Parser
import quopri

def decode_email(msg_str):
    p = Parser()
    message = p.parsestr(msg_str)
    decoded_message = ''
    for part in message.walk():
        charset = part.get_content_charset()
        if part.get_content_type() == 'text/plain':
            part_str = part.get_payload(decode=1)
            decoded_message += part_str.decode(charset)
    return decoded_message

file = open("sample2.txt")
msg = file.read()
file.close()
decoded_string = quopri.decodestring(msg)
print(decoded_string.decode('utf-8'))