By request of @hynek :)

get_leaf_paths.py

# https://twitter.com/hynek/status/1076048147074478080

from boltons.iterutils import remap


DATA = {"a": {"b": 1, "c": {"d": 2}}}
OUT = ["a.b", "a.c.d"]


def get_leaf_paths(root, with_val=False):
    """
    Returns a list of paths, or path-value tuples if with_val=True, of leaf values in a JSON-serializable structure.
    """
    ret = []

    def visit(path, key, value):
        if not isinstance(value, (dict, list)):
            full_path = '.'.join([str(p) for p in (path + (key,))])
            if with_val:
                ret.append((full_path, value))
            else:
                ret.append(full_path)
        return True

    remap(root, visit=visit, reraise_visit=False)

    if with_val:
        return sorted(ret, key=lambda x: x[0])
    return sorted(ret)


leaf_paths = get_leaf_paths(DATA)

assert leaf_paths == OUT