mode.utils.graphs

class mode.utils.graphs.GraphFormatter(root: Any = None, type: str = None, id: str = None, indent: int = 0, inw: str = ' ', **scheme: Any)

Format dependency graphs.

edge_scheme = {'arrowcolor': 'black', 'arrowsize': 0.7, 'color': 'darkseagreen4'}

node_scheme = {'color': 'palegreen4', 'fillcolor': 'palegreen3'}

term_scheme = {'color': 'palegreen2', 'fillcolor': 'palegreen1'}

scheme = {'arrowhead': 'vee', 'fontname': 'HelveticaNeue', 'shape': 'box', 'style': 'filled'}

graph_scheme = {'bgcolor': 'mintcream'}

attr(name: str, value: Any) → str

attrs(d: Mapping = None, scheme: Mapping = None) → str

head(**attrs: Any) → str

tail() → str

label(obj: _T) → str

node(obj: _T, **attrs: Any) → str

terminal_node(obj: _T, **attrs: Any) → str

edge(a: _T, b: _T, **attrs: Any) → str

FMT(fmt: str, *args: Any, **kwargs: Any) → str

draw_edge(a: _T, b: _T, scheme: Mapping = None, attrs: Mapping = None) → str

draw_node(obj: _T, scheme: Mapping = None, attrs: Mapping = None) → str

class mode.utils.graphs.DependencyGraph(it: Iterable = None, formatter: mode.utils.types.graphs.GraphFormatterT[_T] = None)

A directed acyclic graph of objects and their dependencies.

Supports a robust topological sort to detect the order in which they must be handled.

Takes an optional iterator of (obj, dependencies) tuples to build the graph from.

Warning

Does not support cycle detection.

add_arc(obj: _T) → None

Add an object to the graph.

add_edge(A: _T, B: _T) → None

Add an edge from object A to object B.

I.e. A depends on B.

connect(graph: mode.utils.types.graphs.DependencyGraphT[_T]) → None

Add nodes from another graph.

topsort() → Sequence

Sort the graph topologically.

Returns

of objects in the order in which they must be handled.

Return type

List

valency_of(obj: _T) → int

Return the valency (degree) of a vertex in the graph.

update(it: Iterable) → None

Update graph with data from a list of (obj, deps) tuples.

edges() → Iterable

Return generator that yields for all edges in the graph.

to_dot(fh: IO, *, formatter: mode.utils.types.graphs.GraphFormatterT[_T] = None) → None

Convert the graph to DOT format.

Parameters

• fh (IO) – A file, or a file-like object to write the graph to.

• formatter (celery.utils.graph.GraphFormatter) – Custom graph formatter to use.

items() → a set-like object providing a view on D's items