def subgraph(G, nbunch):
    """Returns the subgraph induced on nodes in nbunch.

    Parameters
    ----------
    G : graph
       A NetworkX graph

    nbunch : list, iterable
       A container of nodes that will be iterated through once (thus
       it should be an iterator or be iterable).  Each element of the
       container should be a valid node type: any hashable type except
       None.  If nbunch is None, return all edges data in the graph.
       Nodes in nbunch that are not in the graph will be (quietly)
       ignored.

    Notes
    -----
    subgraph(G) calls G.subgraph()
    """
    return G.subgraph(nbunch)