attribute error: list object has not attribute lstrip in sending an email with attachment

Question

i am attaching a file from a particular path c:\important\log.txt

sender = '[email protected]'
receiver = ['[email protected]']
message = """From: From Pooja Gupta <[email protected]>
To: To Shubha Goel <[email protected]>
Subject: SMTP e-mail test

This is a test e-mail message.
"""

file_name = 'C:\important\log.txt'
msg=MIMEMultipart()
msg['From'] = sender
msg['To'] = receiver
msg['Subject'] = message
msg['Date'] = email.Utils.formatdate(localtime=True)

# build the attachment
att = MIMEBase('application', 'base64')
att.set_payload(open(file_name, 'rb').read())
email.Encoders.encode_base64(att)
att.add_header('Content-Disposition', 'attachment; filename="%s"' % os.path.basename(file_name))
msg.attach(att)

print 'successfully built attachment'
try:
    session = smtplib.SMTP('smtp.gmail.com',587)
    print 'Starting..'
    session.ehlo()
    print 'ehlo executed..'
    session.starttls()
    print 'starttls done'

    session.login(sender,'snxzoumwhpybzvmo')
    print 'logged in'
    session.sendmail(sender,receiver,msg.as_string())
    print 'sendmail executed..now quitting'
    session.close()

except smtplib.SMTPRecipientsRefused:
    print 'Recipient refused'
except smtplib.SMTPAuthenticationError:
    print 'Auth error'
except smtplib.SMTPSenderRefused:
    print 'Sender refused'
except smtplib.SMTPException:
    print('Error')

It keeps on giving me the same error of Attribute error list object has no attribute lstrip the following is the error, stack trace :

Traceback (most recent call last):
  File "<pyshell#8>", line 1, in <module>
    execfile('C:\important\secret_file.pyw')
  File "C:\important\secret_file.pyw", line 45, in <module>
    session.sendmail(sender,receiver,msg.as_string())
  File "C:\Python27\lib\email\message.py", line 137, in as_string
    g.flatten(self, unixfrom=unixfrom)
  File "C:\Python27\lib\email\generator.py", line 83, in flatten
    self._write(msg)
  File "C:\Python27\lib\email\generator.py", line 115, in _write
    self._write_headers(msg)
  File "C:\Python27\lib\email\generator.py", line 164, in _write_headers
    v, maxlinelen=self._maxheaderlen, header_name=h).encode()
  File "C:\Python27\lib\email\header.py", line 410, in encode
    value = self._encode_chunks(newchunks, maxlinelen)
  File "C:\Python27\lib\email\header.py", line 370, in _encode_chunks
    _max_append(chunks, s, maxlinelen, extra)
  File "C:\Python27\lib\email\quoprimime.py", line 97, in _max_append
    L.append(s.lstrip())
AttributeError: 'list' object has no attribute 'lstrip'

Please Help.

Answer 1

it was a small error. receiver parameter was list type. either it should be list converted to string using join method or if it is a single recipient, then pass it as a string only