def __init__(self, base_url):
        self.base_url = base_url
Arrange the given list of classes into a hierarchy of nested lists.
dataset/ETHPy150Open openstack/neutron/neutron/api/views/versions.py/ViewBuilder.__init__--crossover with--dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/inspect.py/getclasstree