Python's execution model
In this section, we would like to introduce you to some important concepts, such as scope, names, and namespaces. You can read all about Python's execution model in the official language reference (https://docs.python.org/3/reference/executionmodel.html), of course, but we would argue that it is quite technical and abstract, so let us give you a less formal explanation first.
Names and namespaces
Say you are looking for a book, so you go to the library and ask someone to obtain this. They tell you something like Second Floor, Section X, Row Three. So, you go up the stairs, look for Section X, and so on. It would be very different to enter a library where all the books are piled together in random order in one big room. No floors, no sections, no rows, no order. Fetching a book would be extremely hard.
When we write code, we have the same issue: we have to try and organize it so that it will be easy for someone who has no prior knowledge...
