Node ports & compass

The edge() and edges() methods use the colon-separated node[:port[:compass]] format for tail and head nodes. This allows to specify an optional node port plus an optional compass point the edge should aim at for the given tail or head node (example).

Caution

As colons are used to indicate port and compass for edges, node names containing one or more literal colons : are currently not supported. GH #54

Tip

There is no such restriction for the label argument, so you can work around by choosing a colon-free name together with the wanted label as demonstrated below

>>> import graphviz  

>>> cpp = graphviz.Digraph('C++')

>>> cpp.node('A', 'std::string')
>>> cpp.node('B', '"spam"')

>>> cpp.edge('A', 'B')

>>> print(cpp.source)  
digraph "C++" {
    A [label="std::string"]
    B [label="\"spam\""]
    A -> B
}