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today I'm going to talk about GUI architectures one you might have heard of is MVC or model view controller but there are others as well such as model view presenter MVP or model view view model mpvm so what's the difference and which one should you use do you even have a choice unfortunately there's no clear consensus of what these architectures actually are I've looked up a bunch of different articles over the last week trying to find the right correct definition of each but I found a lot of contradictions and people going to war over the details so I've tried to distill the main differences between these architectures into three examples of the same relatively simple GUI application but each time I've set it up slightly differently I'll then highlight what I think is the main distinctive feature of the particular architecture it may not always be completely correct because I'm also dependent on how the different GUI Frameworks operate I'm going to use TK enter to show the difference between MVC and MVP and I'll use my iqt with a UI definition file to illustrate mvvm when you start creating a new application choosing the right architecture is important but there are lots of other things to consider as well I've written a free guide to help you get set up quickly you can get it at Ironwood codes design guide it contains the seven steps I take when I design new software and hopefully it helps you avoid some of the mistakes I made in the past iron dot gold slash design guide and Link is also in the description of this video today we're going to work with a really simple to-do list example it's built on TK enter it's one single file I'll show you another version later that uses one of the architectures that we're going to talk about let me start by running this application so this is what you get so we have a list of to do items here I can add a new task like so press enter and it's going to be added to the list and I can click on one of these tasks and delete that like so how does this work well there is simply a fixed constant value task list here that the application is initialized with later on I'll show you a version of the same application that persists the tasks to a database which is actually really simple to set up then we have some texts that are going to be used in the application and then we have a single large class to-do list let me close the terminal and this is a pretty simple class it also contains a lot and that's one of the issues that I'm going to talk about today so it sets the title sets the size it inserts the tasks from the task list variable that we get here as a parameter then...