Comments (3)
The example code looks incorrect (base class must be called with instance as first argument; ClusterGraph
, as defined, requires a string argument for instance creation). NB: latest version?
from graphviz import Graph
class ClusterGraph(Graph):
def __init__(self, name):
super(ClusterGraph, self).__init__('cluster_' + name)
g1 = Graph()
g2 = ClusterGraph('spam')
g1.subgraph(g2)
print g1.source + g2.source
graph {
subgraph cluster_spam {
}
}
graph cluster_spam {
}
Consider passing **kwargs
down to the base class.
The type check isinstance(graph, self.__class__)
succedes with subclass instances. It prevents putting a graph into a subgraph when issubclass(InnerGraph, OuterGraph)
holds (also prevents mixing directed and undirected graphs).
Is there a specific reason requiring the outer graph to be a subclass of the inner graph?
from graphviz.
I have the same error. It's very sad that the users cannot subclass the graph.
import graphviz
class GraphArea(graphviz.Digraph):
def __init__(self, **kwargs):
super().__init__(name='graph', format='svg',
graph_attr=dict(rankdir='LR'),
node_attr=dict(shape='box'))
with self.subgraph(name="cluster_0") as c:
print(c)
GraphArea()
Recursion error.
from graphviz.
Thanks. AFAICT subclassing works as intended. I understand the use case is to define defaults, e.g.:
In [1]: import graphviz
...:
...: class GraphArea(graphviz.Digraph):
...: def __init__(self,
...: name='graph',
...: format='svg',
...: graph_attr={'rankdir': 'LR'},
...: node_attr={'shape': 'box'},
...: **kwargs):
...: super().__init__(name=name,
...: format=format,
...: graph_attr=graph_attr,
...: node_attr=node_attr,
...: **kwargs)
...:
...:
...:
...: g = GraphArea()
...: with g.subgraph(name="cluster_0") as s:
...: s.node('spam')
...: print(g)
digraph "graph" {
graph [rankdir=LR]
node [shape=box]
subgraph cluster_0 {
spam
}
}
Note that in the code you have given GraphArea
silently ignores any given arguments (not passing kwargs
).
If setting defaults is all that is needed, one can do it much simpler with functools.partial
:
import functools
GraphArea = functools.partial(graphviz.Digraph,
name='graph',
format='svg',
graph_attr={'rankdir': 'LR'},
node_attr={'shape': 'box'})
It understand you might want to precreate nodes/edges and possibly subgraphs in __init__
. Not sure if that makes sense (maybe a (factory) function, e.g. in form of an alternate constructor would be much simpler), but that does work for nodes and edges (with subgraphs created by that class also containing the precreated content): You are getting RecursionError
from adding a subgraph in the initializer, which means that this subgraph again creates a subgraph and so on recursively, so I think the error is correct here.
from graphviz.
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from graphviz.