3
Model (table) level permissions can be achieved using the groups facility provided by Django auth. Groups let you create custom permissions at a model level. Instance (row) level would be trickier. You would most likely have to write a custom mechanism to accomplish this.
Here is a Django Snippet that might give you some ideas.
15
Django Guardian seems to be the best solution today for Model instance level permissions.
2
There was an open source release for row/object level permissions by the washington times team that might be of use:
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Source:stackexchange.com