Packages within packages
Just like you can have directories within directories, you can have packages within other packages. For example, imagine that our my_package directory contained another directory called my_sub_package, which itself had an __init__.py file:
As you might expect, you import the modules within a sub-package by prepending the names of the packages that contain it:
from my_package.my_sub_package import my_module my_module.do_something()
There is no limit to how deeply you can nest packages, though in practice it becomes a bit unwieldy if you have too many levels of packages-within-packages. More interestingly, the various packages ...
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