How referencing objects work – namespaces
Key 1: Interrelations between objects.
The scope is the visibility of a name within a code block. Namespace is mapping from names to objects. Namespaces are important in order to maintain localization and avoid name collision. Every module has a global namespace. Modules store mapping from variable name to objects in their __dict__ attribute, which is a normal Python dictionary along with information to reload it, package information, and so on.
Every module's global namespace has an implicit reference to the built-in module; hence, objects that are in the built-in module are always available. We can also import other modules in the main script. When we use the syntax import module name, a mapping with module name to module object is created in the global namespace of the current module. For import statements with syntax such as import modname as modrename, mapping is created with a new name to module object.
We are always in the __main__...
