PYTHON - send email with attachment Error

[PYTHONDUDE]

I came up with the following python to send an email with attachment. the text file is located c:/python/20180227.txt (the dated file is changed daily based on current date, so tomorroow it would be 20180228.txt and so forth). When i run the below the attached text is showing
up IN MY EMAIL AS "CPYTHON20180227.txt". instead of 20180227.txt . Can someone please assist

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

   datestring = datetime.strftime(datetime.now(), '%Y%M%D')


    email_user = '[email protected]'
    email_send = '[email protected]'
    subject = 'Python!'
    msg = MIMEMultipart()
    msg['From'] = email_user
    msg['To'] = email_send
    msg['Subject'] = subject
    body = 'Just testing the email server from Python'

    msg.attach(MIMEText(body,'plain'))

    filename = "C:/PYTHON/" + datestring + '.txt'    #### i believe this is where my error is ?????
    attachment = open(filename, 'rb') #enter file path as filename    
    part = MIMEBase('application','octet-stream')
    part.set_payload(attachment.read())
    encoders.encode_base64(part)
    part.add_header('Content-Disposition' "attachment; filename= "+filename)
    msg.attach(part)
    text= msg.as_string()
    server = smtplib.SMTP('email server', port)
    server.starttls()
    server.login(email_user, "password" )
    message = 'Test from Python'
    server.sendmail(email_user, email_send, text)
    server.quit()

[PYTHONDUDE]

never mind i found the solution basically this did the trick


filename = 'file.txt'
attachment = open("file path" + filename, "rb")

#Search and you will Find
# I am getting there