How to temporarily disable a foreign key constraint in MySQL?

Is it possible to temporarily disable constraints in MySQL?

I have two Django models, each with a ForeignKey to the other one. Deleting instances of a model returns an error because of the ForeignKey constraint:

cursor.execute("DELETE FROM myapp_item WHERE n = %s", n)
transaction.commit_unless_managed()  #a foreign key constraint fails here

cursor.execute("DELETE FROM myapp_style WHERE n = %s", n)
transaction.commit_unless_managed()

Is it possible to temporarily disable constraints and delete anyway?