How to use the dpath.segments.has function in dpath

def test_has(node):
    '''
    Given a node, has should return True for all paths, False otherwise.
    '''
    for k, v in api.walk(node):
        assert api.has(node, k) is True

        # If we are at a leaf, then we can create a value that isn't
        # present easily.
        if api.leaf(v):
            assert api.has(node, k + (0,)) is False

def test_has(node):
    '''
    Given a node, has should return True for all paths, False otherwise.
    '''
    for k, v in api.walk(node):
        assert api.has(node, k) is True

        # If we are at a leaf, then we can create a value that isn't
        # present easily.
        if api.leaf(v):
            assert api.has(node, k + (0,)) is False

def f(obj, pair, counter):
        (segments, found) = pair

        # Skip segments if they no longer exist in obj.
        if not dpath.segments.has(obj, segments):
            return

        matched = dpath.segments.match(segments, globlist)
        selected = afilter and dpath.segments.leaf(found) and afilter(found)

        if (matched and not afilter) or (matched and selected):
            dpath.segments.set(obj, segments, value, creator=None)
            counter[0] += 1

def merger(dst, src, _segments=()):
        for key, found in dpath.segments.kvs(src):
            # Our current path in the source.
            segments = _segments + (key,)

            if len(key) == 0 and not options.ALLOW_EMPTY_STRING_KEYS:
                raise InvalidKeyName("Empty string keys not allowed without "
                                     "dpath.options.ALLOW_EMPTY_STRING_KEYS=True: "
                                     "{}".format(segments))

            # Validate src and dst types match.
            if flags & MERGE_TYPESAFE:
                if dpath.segments.has(dst, segments):
                    target = dpath.segments.get(dst, segments)
                    tt = type(target)
                    ft = type(found)
                    if tt != ft:
                        path = separator.join(segments)
                        raise TypeError("Cannot merge objects of type"
                                        "{0} and {1} at {2}"
                                        "".format(tt, ft, path))

            # Path not present in destination, create it.
            if not dpath.segments.has(dst, segments):
                dpath.segments.set(dst, segments, found)
                continue

            # Retrieve the value in the destination.
            target = dpath.segments.get(dst, segments)

def f(obj, pair, counter):
        (segments, value) = pair

        # Skip segments if they no longer exist in obj.
        if not dpath.segments.has(obj, segments):
            return

        matched = dpath.segments.match(segments, globlist)
        selected = afilter and dpath.segments.leaf(value) and afilter(value)

        if (matched and not afilter) or selected:
            key = segments[-1]
            parent = dpath.segments.get(obj, segments[:-1])

            try:
                # Attempt to treat parent like a sequence.
                parent[0]

                if len(parent) - 1 == key:
                    # Removing the last element of a sequence. It can be
                    # truly removed without affecting the ordering of