一点背景......

前段时间,我在Python上编写了一个处理电子邮件消息的程序,总有一件事就是知道电子邮件是否是"多部分".

经过一些研究,我知道它与包含HTML或附件等的电子邮件有关......但我并不是真的理解它.

我对它的使用仅限于2个实例:

1.当我必须从原始电子邮件中保存附件时

我刚刚在互联网上发现了这一点(可能在这里 - 很抱歉没有记下编写它的人,但我似乎无法再找到他了:/)并将其粘贴在我的代码中

def downloadAttachments(emailMsg, pathToSaveFile):
    """
    Save Attachments to pathToSaveFile (Example: pathToSaveFile = "C:\\Program Files\\")
    """
    att_path_list = []
    for part in emailMsg.walk():
        # multipart are just containers, so we skip them
        if part.get_content_maintype() == 'multipart':
            continue

        # is this part an attachment ?
        if part.get('Content-Disposition') is None:
            continue

        filename = part.get_filename()

        att_path = os.path.join(pathToSaveFile, filename)

        #Check if its already there
        if not os.path.isfile(att_path) :
            # finally write the stuff
            fp = open(att_path, 'wb') …