Create a file-like object for the specified URL to read from.

即创建一个类文件对象为指定的url来读取。

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Feedinfo is the main function, and takes a URL and an optional output stream (file-like object), defaulting to system output (the console).

feedinfo是主函数，负责接收url和可选的输出流(类似文件的对象)，默认输出流为系统输出(控制台)。

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You'd write logic that appends to a list of strings or writes to a file-like object. For instance, the following code generates the E-mail described above.

还要编写附加到字符串列表的逻辑或为类文件对象编写的逻辑。

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