Modernize syntax, drop Python EOL, drop drop Django<1.11, upgrade TravisCI config to v1, add Python 3.8 & Django 3.x

django_mailbox/transports/base.py

@@ -1,19 +1,11 @@
 import email
 
-import six
-
 # Do *not* remove this, we need to use this in subclasses of EmailTransport
-if six.PY3:
-    from email.errors import MessageParseError  # noqa: F401
-else:
-    from email.Errors import MessageParseError  # noqa: F401
+from email.errors import MessageParseError  # noqa: F401
 
 
-class EmailTransport(object):
+class EmailTransport:
     def get_email_from_bytes(self, contents):
-        if six.PY3:
-            message = email.message_from_bytes(contents)
-        else:
-            message = email.message_from_string(contents)
+        message = email.message_from_bytes(contents)
 
         return message

django_mailbox/transports/generic.py

@@ -1,5 +1,4 @@
 import sys
-import six
 
 from .base import EmailTransport
 
@@ -9,13 +8,8 @@ class GenericFileMailbox(EmailTransport):
     _path = None
 
     def __init__(self, path):
-        super(GenericFileMailbox, self).__init__()
-        if six.PY2:
-            self._path = path.encode(
-                sys.getfilesystemencoding()
-            )
-        else:
-            self._path = path
+        super().__init__()
+        self._path = path
 
     def get_instance(self):
         return self._variant(self._path)

django_mailbox/transports/gmail.py

@@ -48,7 +48,7 @@ class GmailImapTransport(ImapTransport):
                     )
                 )
 
-        auth_string = 'user=%s\1auth=Bearer %s\1\1' % (
+        auth_string = 'user={}\1auth=Bearer {}\1\1'.format(
             google_email_address,
             access_token
         )

django_mailbox/transports/imap.py

@@ -88,7 +88,7 @@ class ImapTransport(EmailTransport):
                     safe_message_ids.append(uid)
             except ValueError as e:
                 logger.warning(
-                    "ValueError: %s working on %s" % (e, each_msg[0])
+                    "ValueError: {} working on {}".format(e, each_msg[0])
                 )
                 pass
         return safe_message_ids

django_mailbox/transports/pop3.py

@@ -1,5 +1,3 @@
-import six
-
 from poplib import POP3, POP3_SSL
 
 from .base import EmailTransport, MessageParseError
@@ -24,9 +22,7 @@ class Pop3Transport(EmailTransport):
         self.server.pass_(password)
 
     def get_message_body(self, message_lines):
-        if six.PY3:
-            return six.binary_type('\r\n', 'ascii').join(message_lines)
-        return '\r\n'.join(message_lines)
+        return bytes('\r\n', 'ascii').join(message_lines)
 
     def get_message(self, condition=None):
         message_count = len(self.server.list()[1])