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pk is the attribute that contains the value of the primary key for the model.
Alex KoumparosPython Development Techdegree Student 36,862 Points
To clarify Lazarus's answer,
pk is a shortcut to the model field that is the primary key, i.e., it contains a reference to the primary key field, not the primary key value itself.
For example, if you had a model
User and specified a primary key with the name
user_id, you could query the primary key like this:
Since looking up objects by primary key is so common, Django provides
pk as a convenience shortcut so we don't need to remember the actual primary key name. Thus we can write the same query like this:
For more details, you can check out the official Django documentation