[cse491] [ctb at msu.edu: Re: __iter__]

[C. Titus Brown]

----- Forwarded message from "C. Titus Brown" <ctb at msu.edu> -----

Date: Mon, 19 Oct 2009 18:37:35 -0700
From: "C. Titus Brown" <ctb at msu.edu>
To: Phil Deschaine <deschai5 at gmail.com>
Subject: Re: __iter__

On Mon, Oct 19, 2009 at 09:33:55PM -0400, Phil Deschaine wrote:
> Can you explain why you define __iter__ (self) in lab 7?

It's all because of the required interface.  The WSGI app interface is as
follows:

The server will call the app with

	x = app(environ, start_request)

Then the server will retrieve content from the app by iterating over
the return value:

	content = ''
	for content_chunk in x:
		content += content_chunk

All three examples in the revised lab 7 notes adhere to this interface.
In the class example, 'x' is an object of type WSGIApp; __iter__ is just
how you tell Python what to return when it is iterated over.

Another, simpler response is: that's what works, so use it ;)

cheers,
--titus
-- 
C. Titus Brown, ctb at msu.edu

----- End forwarded message -----

-- 
C. Titus Brown, ctb at msu.edu