add_edges_from

MultiGraph.add_edges_from(ebunch, **attr)

Add all the edges in ebunch.

Parameters:

• ebunch (container of edges) – Each edge given in the container will be added to the graph. The edges can be:

  • 2-tuples (u,v) or
  • 3-tuples (u,v,d) for an edge attribute dict d, or
  • 4-tuples (u,v,k,d) for an edge identified by key k

• attr (keyword arguments, optional) – Edge data (or labels or objects) can be assigned using keyword arguments.

Returns:

Return type:

A list of edge keys assigned to the edges in ebunch.

See also

add_edge()

add a single edge

add_weighted_edges_from()

convenient way to add weighted edges

Notes

Adding the same edge twice has no effect but any edge data will be updated when each duplicate edge is added.

Edge attributes specified in an ebunch take precedence over attributes specified via keyword arguments.

Default keys are generated using the method new_edge_key(). This method can be overridden by subclassing the base class and providing a custom new_edge_key() method.

Examples

>>> G = nx.Graph()   # or DiGraph, MultiGraph, MultiDiGraph, etc
>>> G.add_edges_from([(0,1),(1,2)]) # using a list of edge tuples
>>> e = zip(range(0,3),range(1,4))
>>> G.add_edges_from(e) # Add the path graph 0-1-2-3

Associate data to edges

>>> G.add_edges_from([(1,2),(2,3)], weight=3)
>>> G.add_edges_from([(3,4),(1,4)], label='WN2898')