[Python] How do calls of models.Manager and custom managers work?

The following question was asked by a different user that subsequently removed the question. But I think it is useful to "dig" a bit in how Django's manager logic works.

I extended the models.Manager class and created a custom manager.

class
PublishedManager(models.Manager):
def get_queryset(self):
return super().get_queryset().filter(status=Post.Status.PUBLISHED)

It's more than understandable, BUT how do calls of managers work?

objects = models.Manager() # The
default manager. published = PublishedManager() # Our custom manager.

I don't address get_queryset() method, I just call constructors. Then how does it work?
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