Reports, mainframe data-feeds, human-readable texts, programming source files, and other sorts of text files are stateful. A simple example is a line that might occur in a Python source file
报告、大型机数据输入、可读文本、编程源文件和其它种类的文本文件都是有状态的。
The first is a simple text-based E-mail that simply lists the feeds to which a user has subscribed that have been updated since the user last read them.
第一种是基于简单文本的电子邮件，该邮件仅仅列出用户所订阅的、在上次阅读后已更新的提要。
The for loop iterates over the feeds, finds entries for the desired day, and extracts a few fields to build into the accumulated message text, in message_text.
for 循环遍历提要，查找所需日期的条目，并提取几个字段以构建到 message_text 中积累的消息文本中。
The for loop iterates over the feeds, finds entries for the desired day, and extracts a few fields to build into the accumulated message text, in message_text.
for 循环遍历提要，查找所需日期的条目，并提取几个字段以构建到 message_text 中积累的消息文本中。
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