Few Files Email Python

import smtplib
from smtplib import SMTP_SSL
import email
from email.mime.multipart import MIMEMultipart
from email.mime.base import MIMEBase
from email.mime.text import MIMEText
from email import encoders
import os

files = ['C://Users/олег/Downloads/2fa813ee34de1793bec65216cb4e3ce3.jpg',
         'C://Users/олег/Downloads/2dcf856c4a33ca36eed01940b5d33679.jpg',
         'C://Users/олег/Downloads/programmiruem-na-python-3-e-izdanie.zip',
         'C://Users/олег/Downloads/stefania-ferrario-766802.jpg'
]

def sendFileByFile(filename):
    for filename in files:
        path = filename
        if not os.path.isfile(path):
            raise ("Неверный путь к файлу")
        else:
            filename = os.path.basename(path)

        basename = os.path.basename(files[0])
        address = 'z'

    #Compose attachment
        part = MIMEBase('application', "octet-stream")
        part.set_payload(open(files[0], "rb").read())
        encoders.encode_base64(part)
        part.add_header('Content-Disposition', 'attachment; filename = "%s"' % basename)

    #Compose message
        msg = MIMEMultipart()
        msg['From'] = 'z'
        msg['To'] = 'z'
        msg.attach(part)

    #Send mail
        smtp = smtplib.SMTP('smtp.mail.ru', 25)
        smtp.ehlo()
        smtp.starttls()

        smtp.login(address, 'sender_email_password')
        smtp.sendmail(address, address, msg.as_string())
        print('File %s is sent' % filename)
        smtp.quit()

sendFileByFile('2fa813ee34de1793bec65216cb4e3ce3.jpg')