The..... operation allows us to produce list of those attribute that we wish to see in the result leaving other attribute
Answers
We have already seen how we can use a dictionary to group related data together, and how we can use functions to create shortcuts for commonly used groups of statements. A function performs an action using some set of input parameters. Not all functions are applicable to all kinds of data. Classes are a way of grouping together related data and functions which act upon that data.
A class is a kind of data type, just like a string, integer or list. When we create an object of that data type, we call it an instance of a class.
As we have already mentioned, in some other languages some entities are objects and some are not. In Python, everything is an object – everything is an instance of some class. In earlier versions of Python a distinction was made between built-in types and user-defined classes, but these are now completely indistinguishable. Classes and types are themselves objects, and they are of type type. You can find out the type of any object using the type function