How to use the apispec.yaml_utils.load_operations_from_docstring function in apispec

def test_load_operations_from_docstring_empty_docstring(docstring):
    assert yaml_utils.load_operations_from_docstring(docstring) == {}

return operations

    operations = {}

    # views can be class based
    if view.get("attr"):
        global_meta = load_operations_from_docstring(view["callable"].__doc__)
        if global_meta:
            operations.update(global_meta)
        f_view = getattr(view["callable"], view["attr"])
    # or just function callables
    else:
        f_view = view.get("callable")

    methods = view.get("request_methods")
    view_operations = load_operations_from_docstring(f_view.__doc__)
    if not view_operations:
        view_operations = {}
        if is_string(methods):
            methods = [methods]
        if not methods:
            methods = ALL_METHODS[:]
        operation = load_yaml_from_docstring(f_view.__doc__)
        if operation:
            for method in methods:
                view_operations[method.lower()] = operation
        elif autodoc:
            for method in methods:
                view_operations.setdefault(method.lower(), {"responses": {}})
    operations.update(view_operations)

    return operations