# Copyright (C) 2002 Python Software Foundation# Author: barry@zope.com (Barry Warsaw)"""Base class for MIME multipart/* type messages."""fromemailimportMIMEBaseclassMIMEMultipart(MIMEBase.MIMEBase):"""Base class for MIME multipart/* type messages."""def__init__(self,_subtype='mixed',boundary=None,*_subparts,**_params):"""Creates a multipart/* type message. By default, creates a multipart/mixed message, with proper Content-Type: and MIME-Version: headers. _subtype is the subtype of the multipart content type, defaulting to `mixed'. boundary is the multipart boundary string. By default it is calculated as needed. _subparts is a sequence of initial subparts for the multipart. It must be possible to convert this sequence to a list. You can always attach new subparts to the message by using the attach() method. Additional parameters for the Content-Type: header are taken from the keyword arguments (or passed into the _params argument). """MIMEBase.MIMEBase.__init__(self,'multipart',_subtype,**params)self.attach(*list(_subparts))