Enumerate - Intermediate Python Programming p.7

Key Takeaways

what is going on everybody Welcome to part seven of our intermediate Python Programming tutorial Series in this tutorial we're going to be talking about the built-in function enumerate so what enumerate is going to do is it's going to return a tuple containing the basically the count along the way and then the object itself or the item itself that you were iterating over so you use enumerate on iterable so where's my mouse first let's say uh we're just going to say an example equals uh left right up and down and what we're going to say is we'll just do uh we'll do 4 I in range Len example print I example I so this is an example of code that you might find yourself writing to produce the following like basically anytime you find yourself or I would say most of the time I'm trying to think of an example where I've not been screwing up when I do this but pretty much anytime you're going to say 4 I in range of a length of something you're probably doing it wrong okay so just keep that in mind I've done it probably no I know I've done it in some of the tutorials for sure um just because like I just never use enumerate I just don't think about it but lately in my own code I've been trying to use enumerate just because it exists and you should do it so anyways this is not the right way to go about it instead what you should say is something like this for i j in enumerate example print I um I'll print the other one just to do it I guess but as you can see this one ended here or this is the first one this is the second one exact same output just a little cleaner um it makes a little bit more sense it's the way it's supposed to be you're also not doing like this range Len nonsense you just don't need to uh so don't do it so that's one example of enumerate for most people that's probably all you need to do uh you can use enumerate over a dictionary and a lot of other aables I would show you a dictionary you can go to the sample code if you really want to see it but it's basically the exact same thing as we just did here and I just don't want to make a dictionary but I will also show that you can easily because we have Tuple what can you do with basically list of tupal you can do the following you can say new dictionary we're going to build a dictionary in equals dict enumerate um and then we'll enumerate the example and now let's print new dict there we go so basically in this case we've created a dictionary where the key is that index value of En numerate and then the value is the thing that was in the list now of course since I a second ago I just told you I didn't want to make a dictionary well oh look at that we got a dictionary so we could just do this we'll do list comprehension print i j k or JK that's fine for um let's see print i j k for i j in enumerate new di so here we just get 0 0 1 1 22 3 3 because that is our dictionary was the keys were just 0 1 2 3 and and so on so that was just not you're probably never going to enumerate over a dictionary that uh has keys like that um but just showing that you can do it over a dictionary if you so chose so that's all on enumerate it's just a really simple um addition to the python standard Library something useful mostly for when you find yourself in this case this is just always when you would use enumerate for the most part I'm sure there's lots of other times you might use it are things that you in tasks that you might do but for the most part this is when I found myself doing what I should have been doing enumerate so uh in the next tutorial we're going to be talking about the zip function but if you do have any questions comments concerns on enumerate feel free to leave below otherwise I'll see you in the next tutorial