May 2018
Intermediate to advanced
380 pages
9h 37m
English
If __all__ is not defined in __init__.py, then import * only imports the modules within the specified package, not all sub-packages or their modules. For example, from video.formats import * only imports the video formats; the modules in the effects/ directory will not be included.
This is a best practice for Python programmers: as the Zen of Python (https://www.python.org/dev/peps/pep-0020/) states, explicit is better than implicit. Thus, importing a specific sub-module from a package is a good thing, whereas import * is frowned upon because of the possibility of variable name conflicts.
Packages have the __path__ attribute, which is rarely used. This attribute is a list that has the name of the directory where the package's ...