human
I wrote the below code

    def _create_instance_type(**updates):
        instance_type = {'id': 2, 'name': 'm1.tiny', 'memory_mb': 512, 'vcpus': 1, 'vcpu_weight': None, 'root_gb': 0, 'ephemeral_gb': 10, 'flavorid': 1, 'rxtx_factor': 1.0, 'swap': 0, 'deleted_at': None, 'created_at': datetime.datetime(2014, 8, 8, 0, 0, 0), 'updated_at': None, 'deleted': False, 'disabled': False, 'is_public': True, 'extra_specs': {}}
        if updates:
            instance_type.update(updates)
        return instance_type
    INSTANCE_TYPES = {'m1.tiny': _create_instance_type(id=2, name='m1.tiny', memory_mb=512, vcpus=1, vcpu_weight=None, root_gb=0, ephemeral_gb=10, flavorid=1, rxtx_factor=1.0, swap=0), 'm1.small': _create_instance_type(id=5, name='m1.small', memory_mb=2048, vcpus=1, vcpu_weight=None, root_gb=20, ephemeral_gb=0, flavorid=2, rxtx_factor=1.0, swap=1024), 'm1.medium': _create_instance_type(id=1, name='m1.medium', memory_mb=4096, vcpus=2, vcpu_weight=None, root_gb=40, ephemeral_gb=40, flavorid=3, rxtx_factor=1.0, swap=0), 'm1.large': _create_instance_type(id=3, name='m1.large', memory_mb=8192, vcpus=4, vcpu_weight=10, root_gb=80, ephemeral_gb=80, flavorid=4, rxtx_factor=1.0, swap=0), 'm1.xlarge': _create_instance_type(id=4, name='m1.xlarge', memory_mb=16384, vcpus=8, vcpu_weight=None, root_gb=160, ephemeral_gb=160, flavorid=5, rxtx_factor=1.0, swap=0)}
    fixed_ip_fields = {'address': '10.0.0.3', 'address_v6': 'fe80::a00:3', 'network_id': 'fake_flat'}
    def fake_flavor_get_all(*a, **k):
        return INSTANCE_TYPES.values()
    @classmethod
    def fake_flavor_get_by_name(cls, context, name):
        return INSTANCE_TYPES[name]
    @classmethod
    def fake_flavor_get(cls, context, id):
        for inst_type in INSTANCE_TYPES.values():
            if (str(inst_type['id']) == str(id)):
                return inst_type
        return None
    def fake_fixed_ip_get_by_instance(context, instance_id):
        return [FakeModel(fixed_ip_fields)]
    funcs = {'nova.objects.flavor._flavor_get_all_from_db': fake_flavor_get_all,...

What's a good function header?
assistant
#Here's a good function header.

def stub_out_db_instance_api(test, injected=True):