And the sum total of this is that tuples are sort of a more efficient version of lists that you can't modify. And the for loop basically creates an iteration variable and then bounces through the things that are in a tuple. But that's part of the efficiency of tuples is that they're not mutable and that allows them to be stored more densely than lists.

And now, in this little bit of lesson, we're going to talk about some tuples, and we're going to create a list of the most common words, and find out how to sort a dictionary by the values instead of by the key. And then goes through the words and does the idiom of using dictionary get to maintain the counters and we print it out at the very end. Now, instead of printing this out, we are going to, let me do this in a couple of steps, make a new tuple and I'll just call it newt equals (v,k).

And another of the Coursera Internet History Technology and Security office hours. We are here in Puebla, Mexico, and I'd like you to meet some of your fellow students in the class. Tomorrow night, I think we're going to be in Mexico City, and I hope some students show up there, as well.

And, additionally, I wanted to make the process of attaching events into the page, because when you're building an interactive JavaScript application, you need to listen for when the user's going to be doing certain things. One was that I provided an explicit plug-in architecture so that people could write plug-ins and add them into the JQuery library and now they could get the full advantage of this framework. And part of that was setting up a nonprofit and making sure there were enough people working in every aspect of it, such that when I eventually came and joined Khan Academy, I actually stepped down from the JQuery project.

And if you look at other data representations like the property lists that were used at, at NeXT and then later at Apple, except for a couple of cosmetic changes, it's the JSON notation as well. And we'd developed a platform for doing applications which could be delivered through unmodified web browsers, what today is called AJAX. But we produced some brilliant demonstrations and we were starting to make some progress in trying to convince, you know, potential customers that they should adopt the style of application and development.

I know we'll come for the food if nothing else. That's called gringa. This is with cheese.