There are several different ways of referencing a function in another module.
You can also alias the module so that a shorter name can be used:
You can import a module so that all the functions are treated as local to this module:
You can require a module so that you can use the macros defined in that module.
You can use a module to run the
__using__ function from that module in your context.
These don’t have to be at the top of the module, you can use them within a function to restrict scope (not so sure about using __using__ this way…).
These also have parameterized versions so that you can choose what to import (only some, exclude some, rename them).
This can make them seem complex …