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Write cosigner default

welcome back in the last lesson we looked at how dictionaries handle missing keys using just what they have for being dictionaries in this lesson we're ready to look a bit more closely at default dict the first thing you need to know about default dict is that it's part of the standard library here is the documentation for the python standard library and if i scroll down you can see that here there's an entry for collections under data types if i click on that and follow that link then there's an entry here for default dict this is a dict subclass remember i told you that default dict inherits from dict and what's interesting about it is that it calls a factory function to supply missing values and what they're referring to of course is values which are missing for a certain key when you're trying to access a key so in case that was a bit too quick i clicked on that link and came here to the documentation for default dix what is interesting about default dig is that if a key isn't present in the dictionary or in the default dict in this case then that triggers missing and missing in turn triggers default factory and this is what is going to generate a default value for the key which you were trying to access but wasn't there this will become a bit more clear as we're looking at examples in the reple in fact let's go there now so here i am at the terminal now i'm going to enter the python rebel and the first thing i'm going to do here is that from collections i'm going to import default dict there we go so this is what you would do anytime that you want to work with default dict you would load it into memory from a package called collections before we move on i would just like to prove to you that it is a subclass of dict and i'll do that using is subclass this takes two parameters the first is default dict so the object which i'm checking and the second is the class which i want to know this object might be inheriting from and that would be dict and this returns true so you can see i'm not lying defaultic does inherit from dict and that means that for the most part it behaves just like a normal dictionary okay so let's create a default dict i'm going to name this one defd and i will use the assignment operator and then the syntax is default dict and here i have to pass a callable so this can be float int set list etc and i'm going to go with list for now now you'll notice that i just used the keyword list there's no open and close of parentheses after list in fact that's a common mistake so do pay attention to that okay so now...