Envoie mail python

class EnvoieMail:
    import sys
    import os
    from smtplib import SMTP
    from email.mime.multipart import MIMEMultipart
    from email.mime.base import MIMEBase
    from email.mime.text import MIMEText
    from email.utils import formatdate
    from email import Encoders

    def send_email(senf_from, send_to, subject, files=[], server="localhost"
        assert types(sent_to)==list
        assert types(files)==list
        msg = MIMEMultipart()
        msg['From'] = send_from
        msg['To'] = COMMASPACE.join(send_to)
        msg['Date'] = formatdate(localtime=True)
        msg['Subject'] = subject

        for f in files:
            part = MIMEBase('application', "octet-stream")
            print f
            part.set_playload(open(f,"rb").read())
            Encoders.encode_base64(part)
            part.add_header('Content_Disposition', 'attachement filename="%s' %os.path.basename(f))
            
        msg.attach(part)

        smtp = smtplib.SMTP(server)
        smtp.sendmail(senf_from, send_to, msg.as_string())
        smtp.close()

        retour = "Une erreur s'est produite lors de l'envoie de mail"
        files = ["monfichier1", "chemin du fichier']
        destinataires = [ 'liste des destinataires' ]

        try:
            send_mail('expediteur@monsite.com', 'destinataire', "Sujet du mail",  "Texte du message", files, 'smtp.free.fr')
        except:
            send_mail('expediteur@monsite.com', [ 'adresse@secours.fr' ], "[ERROR ] Sujet du message", retour, [], 'smtp.free.fr')