The email package version 1.0, prototyped as mimelib

<http://sf.net/projects/mimelib>.  There /are/ API differences between
mimelib and email, but most of the implementations are shared (except
where cool Py2.2 stuff like generators are used).

Lib/email/MIMEBase.py

@@ -0,0 +1,24 @@
+# Copyright (C) 2001 Python Software Foundation
+# Author: barry@zope.com (Barry Warsaw)
+
+"""Base class for MIME specializations.
+"""
+
+import Message
+
+
+
+class MIMEBase(Message.Message):
+    """Base class for MIME specializations."""
+
+    def __init__(self, _major, _minor, **_params):
+        """This constructor adds a Content-Type: and a MIME-Version: header.
+
+        The Content-Type: header is taken from the _major and _minor
+        arguments.  Additional parameters for this header are taken from the
+        keyword arguments.
+        """
+        Message.Message.__init__(self)
+        ctype = '%s/%s' % (_major, _minor)
+        self.add_header('Content-Type', ctype, **_params)
+        self['MIME-Version'] = '1.0'