Error with isochrone example script

[tuschla]

Executing the isochrone example script produces the following error

TypeError                                 Traceback (most recent call last)
Cell In[1], [line 24](vscode-notebook-cell:?execution_count=1&line=24)
     [22](vscode-notebook-cell:?execution_count=1&line=22) polygons = []
     [23](vscode-notebook-cell:?execution_count=1&line=23) for l in limits:
---> [24](vscode-notebook-cell:?execution_count=1&line=24)     p = gnx.isochrone_polygon(graph, source, l, weight="length")
     [25](vscode-notebook-cell:?execution_count=1&line=25)     polygons.append(p)

File [~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:102](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:102), in isochrone_polygon(graph, source, limit, weight, tolerance)
    [100](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:100) ego_graph = gnx.extended_ego_graph(working_graph, source, limit, distance=weight)
    [101](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:101) # Compute edges voronoi cells
--> [102](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:102) edge_voronoi_cells = get_edges_voronoi_cells(working_graph, tolerance)
    [103](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:103) # Set ego-graph edges cells
    [104](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:104) isochrone_polygons = []

File [~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:21](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:21), in get_edges_voronoi_cells(graph, tolerance)
     [19](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:19) edge_as_lines = graph.get_edges_as_line_series()
     [20](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:20) lines = list(edge_as_lines)
---> [21](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:21) edge_cells = gnx.compute_voronoi_cells_from_lines(lines, tolerance)
     [22](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:22) edge_cells_as_series = gpd.GeoSeries({e: cell for e, cell in zip(edge_as_lines.index, edge_cells)})
     [23](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/tools/isochrones.py:23) edge_cells_as_series.crs = graph.crs

File [~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:243](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:243), in compute_voronoi_cells_from_lines(lines, tolerance)
    [226](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:226) def compute_voronoi_cells_from_lines(lines: list, tolerance=1e-7) -> list:
    [227](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:227)     """Compute the voronoi cells of given generic lines. Input linestrings can be not simple.
    [228](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:228) 
    [229](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:229)     Parameters
   (...)
    [241](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:241) 
    [242](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:242)     """
--> [243](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:243)     simple_segments_mapping = split_as_simple_segments(lines, tolerance)
    [244](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:244)     all_segments = [list(s.coords) for i in range(len(lines)) for s in simple_segments_mapping[i]]
    [245](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:245)     bounds = MultiLineString(lines).bounds

File [~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:208](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:208), in split_as_simple_segments(lines, tol)
    [191](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:191) """Split a list of lines to simple segments (linestring composed by two points). All returned segments do not
    [192](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:192) cross themselves except at extremities.
    [193](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:193) 
   (...)
    [205](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:205) 
    [206](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:206) """
    [207](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:207) split_lines_mapping = defaultdict(list)
--> [208](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:208) all_split_lines = split_linestring_as_simple_linestrings(MultiLineString(lines))
    [209](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:209) j = 0
    [210](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:210) sub_line = all_split_lines[j]

File [~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:186](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:186), in split_linestring_as_simple_linestrings(line)
    [184](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:184)     if line.geom_type == 'LineString' and mls.geom_type == 'MultiLineString':
    [185](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:185)         mls = linemerge(mls)
--> [186](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:186)     return list(mls)
    [187](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:187) else:
    [188](https://file+.vscode-resource.vscode-cdn.net/home/lt/kamaro/oepnv/~/kamaro/oepnv/.venv/lib/python3.8/site-packages/geonetworkx/utils/voronoi_utils.py:188)     return [line]

TypeError: 'MultiLineString' object is not iterable```