To compare two model instances, just use the standard Python comparison operator, the double equals sign: ==. Behind the scenes, that compares the primary key values of two models.
Using the Entry example above, the following two statements are equivalent:
>>> some_entry == other_entry >>> some_entry.id == other_entry.id
If a model's primary key isn't called id, no problem. Comparisons will always use the primary key, whatever it's called. For example, if a model's primary key field is called name, these two statements are equivalent:
>>> some_obj == other_obj >>> some_obj.name == other_obj.name