Practice problem using lambda inside the class

[ndc85430]

Of course you get that output, because check_angles returns a function, which you then need to call.

Having said that, this is not really a good case for using a lambda because here all it does is complicate things. If you at least want to get used to passing functions around, then look at using lambdas with say, map, filter or even passing a function for the key argument of the sorted function (or the sort method on sequences). reduce is another example of a function that takes a function as an argument (a so-called "higher-order function"), but it might be a bit more complicated to understand how it works.