ASCII-Codec in Python3 [SOLVED]

[AlphaInc]

Hello everyony,

I have a Python-Script which worked fine under Python2 but when I try to run it in Python3 I get the following error:

Traceback (most recent call last):
  File "debug2.py", line 49, in <module>
    sender.sendmail(sendTo, emailSubject, emailContent)
  File "debug2.py", line 39, in sendmail
    session.sendmail(GMAIL_USERNAME, recipient, headers + "\r\n\r\n" + content)
  File "/usr/lib/python3.7/smtplib.py", line 855, in sendmail
    msg = _fix_eols(msg).encode('ascii')
UnicodeEncodeError: 'ascii' codec can't encode characters in position 131-133: ordinal not in range(128)

Since Python2 reached it's EOL I wanted to "update" my scripts to Python3 and most of them worked out pretty well.

This is one of my scripts:

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import smtplib
import time

f1 = open("../index/mail.txt","r")
mail = f1.read() [:-1]

f2 = open("../index/passwd.txt","r")
passwd = f2.read() [:-1]

f3 = open("../index/receiver.txt","r")
receiver = f3.read() [:-1]

#Email Variables
SMTP_SERVER = 'smtp.gmail.com'  #Email Server (don't change!)
SMTP_PORT = 587                 #Server Port (don't change!)
GMAIL_USERNAME = mail           #change this to match your gmail account
GMAIL_PASSWORD = passwd         #change this to match your gmail password

class Emailer:
    def sendmail(self, recipient, subject, content):

        #Create Headers
        headers = ["From: " + GMAIL_USERNAME, "Subject: " + subject, "To: " + recipient,
                   "MIME-Version: 1.0", "Content-Type: text/html"]
        headers = "\r\n".join(headers)

        #Connect to Gmail Server
        session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)
        session.ehlo()
        session.starttls()
        session.ehlo()

        #Login to Gmail
        session.login(GMAIL_USERNAME, GMAIL_PASSWORD)

        #Send Email & Exit
        session.sendmail(GMAIL_USERNAME, recipient, headers + "\r\n\r\n" + content)
        session.quit

sender = Emailer()

sendTo = receiver
emailSubject = "Subject"
emailContent = "ÄÖÜ"

#Sends an email to the "sendTo" address with the specified "emailSubject" as the subject and "emailConten$
sender.sendmail(sendTo, emailSubject, emailContent)

I only get the error when I use something like an 'äöü' which is pretty common for the german language. In Python2 I had a similiar issue which I could resolve by using the

coding:utf-8

line in the head. How do you solve this in Python3?

[Gribouillis]

The documentation of smtplib.SMTP.sendmail() says

msg may be a string containing characters in the ASCII range, or a byte
string. A string is encoded to bytes using the ascii codec, and lone
\r and \n characters are converted to \r\n characters.

As you want to send a string containing characters outside the ASCII range, I suggest that you encode the string manually using another encoding, such as utf8, so try this

msg = (headers + "\r\n\r\n" + content).encode('utf8')
session.sendmail(GMAIL_USERNAME, recipient, msg)

[AlphaInc]

The documentation of smtplib.SMTP.sendmail() says

msg may be a string containing characters in the ASCII range, or a byte
string. A string is encoded to bytes using the ascii codec, and lone
\r and \n characters are converted to \r\n characters.

As you want to send a string containing characters outside the ASCII range, I suggest that you encode the string manually using another encoding, such as utf8, so try this

msg = (headers + "\r\n\r\n" + content).encode('utf8')
session.sendmail(GMAIL_USERNAME, recipient, msg)

Thanks for your reply.
I edited the ending of my file to this (I hope you meant that).

        #Send Email & Exit
        msg = (headers + "\r\n\r\n" + content).encode('utf8')
        session.sendmail(GMAIL_USERNAME, recipient, msg)
        session.quit

sender = Emailer()

sendTo = receiver
emailSubject = "Subject"
emailContent = "ÄÖÜ"

#Sends an email to the "sendTo" address with the specified "emailSubject" as the subject and "emailConten$
sender.sendmail(sendTo, emailSubject, emailContent)

When I try to execute it I get the following error:

  File "debug2.py", line 40
    msg = (headers + "\r\n\r\n" + content).encode('utf8')
                                                        ^
TabError: inconsistent use of tabs and spaces in indentation

I don't see the error here tbh.

[Gribouillis]

Make sure the python file is indented with 4 spaces instead of tab characters. You can use the old but excellent reindent command to reindent the program, or a more recent tool such as the black module, or replace the tab characters by 4 space characters with your editor.

Also note that your editor can be configured to enter 4 spaces when you hit the tabulation key. Use this configuration for Python programming.

[AlphaInc]

Make sure the python file is indented with 4 spaces instead of tab characters. You can use the old but excellent reindent command to reindent the program, or a more recent tool such as the black module, or replace the tab characters by 4 space characters with your editor.

Also note that your editor can be configured to enter 4 spaces when you hit the tabulation key. Use this configuration for Python programming.

Yeah, of course there was a tab, stupid me
Thanks for the help, now it works