Key 3: Creating a custom loader for modules.
Import statements get references of other module objects in the current module's namespace. It consists of searching the module, executing code to create a module object, updating caches (
sys.modules), updating modules namespace, and creating a reference to new module being imported.
__import__ function searches and executes the module to create a module object. The
importlib library has the implementation, and it also provides a customizable interface to the import mechanism. Various classes interact to get the job done. The
__import__ function should return a module object. For example, in the following example, we are creating a module finder, which checks ...