No, it is not. The South is considered the de facto standard for database migration in Django. Further reading can be found in the Django wiki.
From the release notes for version 1.2:
Contrib-01 (Add South to contrib) - the general consensus - including the Southern lead developer - is that the South is not yet ready to be the bonafide part of Django.
This is most likely still relevant. The South has its limitations, it still has spaces that can be seen as flaws when they are django.contrib modules.
However, I want to add: the south is still very useful.
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