joe-jordan

def find_all_cycles(G, source=None, cycle_length_limit=None):
    """forked from networkx dfs_edges function. Assumes nodes are integers, or at least
    types which work with min() and > ."""
    if source is None:
        # produce edges for all components
        nodes=[i[0] for i in nx.connected_components(G)]
    else:
        # produce edges for components with source
        nodes=[source]
    # extra variables for cycle detection: