[Django]-Django addConstraints raises a TypeError on Postgres

As it turns out, I had simplified my question by changing the constraint name, that was named name='%(app_label)s_%(class)s_value_matches_type in my code, for the sake of clarity.

But it seems that this name is the cause of the TypeError. Replacing the name fixes it.

You are using Django version 2, but interpolation of %(app_label)s and %(class)s was added in version 3.