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Node ports & compass
--------------------
The :meth:`~.Graph.edge` and :meth:`~.Graph.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 (:ref:`example <btree.py>`).
.. 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 <https://github.com/xflr6/graphviz/issues/53>`_
.. 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
.. doctest::
>>> import graphviz # doctest: +NO_EXE
>>> cpp = graphviz.Digraph('C++')
>>> cpp.node('A', 'std::string')
>>> cpp.node('B', '"spam"')
>>> cpp.edge('A', 'B')
>>> print(cpp.source) # doctest: +NORMALIZE_WHITESPACE
digraph "C++" {
A [label="std::string"]
B [label="\"spam\""]
A -> B
}
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