class UnsafeConstructor(FullConstructor):

    def find_python_module(self, name, mark):
        return super(UnsafeConstructor, self).find_python_module(name, mark, unsafe=True)

    def find_python_name(self, name, mark):
        return super(UnsafeConstructor, self).find_python_name(name, mark, unsafe=True)

    def make_python_instance(self, suffix, node, args=None, kwds=None, newobj=False):
        return super(UnsafeConstructor, self).make_python_instance(
            suffix, node, args, kwds, newobj, unsafe=True)

    def set_python_instance_state(self, instance, state):
        return super(UnsafeConstructor, self).set_python_instance_state(
            instance, state, unsafe=True)

UnsafeConstructor.add_multi_constructor(
    'tag:yaml.org,2002:python/module:',
    UnsafeConstructor.construct_python_module)

UnsafeConstructor.add_multi_constructor(
    'tag:yaml.org,2002:python/object:',
    UnsafeConstructor.construct_python_object)

UnsafeConstructor.add_multi_constructor(
    'tag:yaml.org,2002:python/object/new:',
    UnsafeConstructor.construct_python_object_new)

UnsafeConstructor.add_multi_constructor(
    'tag:yaml.org,2002:python/object/apply:',
    UnsafeConstructor.construct_python_object_apply)

Warm-up