skbio.workflow.requires

class skbio.workflow.requires(option=None, values=<skbio.workflow.Exists object>, state=None)

Decorator that executes a function if requirements are met

Parameters

• option (any Hashable object) – An option that is required for the decorated method to execute. This option will be looked up within the containing Workflow``s' ``options.

• values (object) – A required value. This defaults to anything indicating that the only requirement is that the option exists. It can be useful to specify not_none which indicates that the requirement is satisfied if the option exists and it holds a value that is not None. Values also supports iterables or singular values.

• state (Function) – A requirement on workflow state. This must be a function that accepts a single argument, and returns True to indicate the requirement is satisfied, or False to indicate the requirement is not satisfied. This method will be passed the containing Workflow``s' ``state member variable.

Built-ins

__call__(func)	Wrap a function
__hash__	Return hash(self).

Methods