StepFormatter

Graph formatter for :class:Blueprint.

Attributes

Attribute	Type	Description
blueprint_prefix	string = ⧉	Visual symbol used as a prefix for labels of steps marked as the last step in a blueprint.
conditional_prefix	string = ∘	Visual symbol used as a prefix for labels of steps that are defined as conditional.
blueprint_scheme	dict = {'shape': 'parallelogram', 'color': 'slategray4', 'fillcolor': 'slategray3'}	Dictionary of Graphviz attributes defining the visual style, including shape and color, for blueprint nodes.

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Methods

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label()

@classmethod
def label(
    step: [Step](step.md?sid=celery_bootsteps_step)
) - > string

Generates a formatted string label for a step, combining a type-specific prefix with the step's identifier or default label.

Parameters

Name	Type	Description
step	[Step](step.md?sid=celery_bootsteps_step)	The blueprint step object to generate a label for

Returns

Type	Description
string	The prefixed and encoded label string for the step, or None if no step is provided

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node()

@classmethod
def node(
    obj: [Step](step.md?sid=celery_bootsteps_step),
    **attrs: dict
) - > object

Renders a graph node for a step, applying specialized parallelogram styling if the object is a terminal blueprint step.

Parameters

Name	Type	Description
obj	[Step](step.md?sid=celery_bootsteps_step)	The step object to be rendered as a graph node
**attrs	dict	Additional Graphviz attributes to apply to the node

Returns

Type	Description
object	The rendered node object produced by the underlying draw_node method

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edge()

@classmethod
def edge(
    a: [Step](step.md?sid=celery_bootsteps_step),
    b: [Step](step.md?sid=celery_bootsteps_step),
    **attrs: dict
) - > object

Renders a graph edge between two steps, modifying the arrow style and color if the source step is a terminal blueprint node.

Parameters

Name	Type	Description
a	[Step](step.md?sid=celery_bootsteps_step)	The source step node where the edge originates
b	[Step](step.md?sid=celery_bootsteps_step)	The destination step node where the edge points
**attrs	dict	Additional Graphviz attributes to apply to the edge

Returns

Type	Description
object	The rendered edge object produced by the underlying draw_edge method

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