__init__.py 文件源码

def _create_hyp_nested_strategy(simple_class_strategy):
    """
    Create a recursive attrs class.
    Given a strategy for building (simpler) classes, create and return
    a strategy for building classes that have as an attribute:
        * just the simpler class
        * a list of simpler classes
        * a dict mapping the string "cls" to a simpler class.
    """
    # A strategy producing tuples of the form ([list of attributes], <given
    # class strategy>).
    attrs_and_classes = st.tuples(lists_of_attrs(defaults=True),
                                  simple_class_strategy)

    return (attrs_and_classes.flatmap(just_class) |
            attrs_and_classes.flatmap(list_of_class) |
            attrs_and_classes.flatmap(dict_of_class))