# Functions¶

Functional interface to graph methods and assorted utilities.

## Graph¶

`degree` (G[, nbunch, weight]) |
Return degree of single node or of nbunch of nodes. |

`degree_histogram` (G) |
Return a list of the frequency of each degree value. |

`density` (G) |
Return the density of a graph. |

`info` (G[, n]) |
Print short summary of information for the graph G or the node n. |

`create_empty_copy` (G[, with_nodes]) |
Return a copy of the graph G with all of the edges removed. |

`is_directed` (G) |
Return True if graph is directed. |

## Nodes¶

`nodes` (G) |
Return a copy of the graph nodes in a list. |

`number_of_nodes` (G) |
Return the number of nodes in the graph. |

`nodes_iter` (G) |
Return an iterator over the graph nodes. |

`all_neighbors` (graph, node) |
Returns all of the neighbors of a node in the graph. |

`non_neighbors` (graph, node) |
Returns the non-neighbors of the node in the graph. |

`common_neighbors` (G, u, v) |
Return the common neighbors of two nodes in a graph. |

## Edges¶

`edges` (G[, nbunch]) |
Return list of edges incident to nodes in nbunch. |

`number_of_edges` (G) |
Return the number of edges in the graph. |

`edges_iter` (G[, nbunch]) |
Return iterator over edges incident to nodes in nbunch. |

`non_edges` (graph) |
Returns the non-existent edges in the graph. |

## Attributes¶

`set_node_attributes` (G, name, values) |
Set node attributes from dictionary of nodes and values |

`get_node_attributes` (G, name) |
Get node attributes from graph |

`set_edge_attributes` (G, name, values) |
Set edge attributes from dictionary of edge tuples and values. |

`get_edge_attributes` (G, name) |
Get edge attributes from graph |