# Parameter
## *class* Parameter
An interface for working with workflow parameters on Redivis. Parameters are used to store sets of values that can be referenced across transforms and notebooks in a workflow.
## Constructors
## Examples
import redivis
workflow = redivis.workflow("username.workflow_name")
parameter = workflow.parameter("my_param").create(values=["foo","bar"])
print(parameter.get_values()) # ["foo", "bar"]
parameter.update(values=["hello","world"])
print(parameter.get_values()) # ["hello", "world"]
## Attributes
| Name | Description |
|---|
workflow | A reference to the Workflow instance that is associated with this parameter. |
properties | A dict containing the API resource representation of the parameter. This will only be populated after certain methods are called, particularly the get method, and will otherwise be None. |
qualified_reference | The fully qualified reference to this parameter For example, imathews.example_workflow_climate_analysis:x7kh.my_param:27sa
|
scoped_reference | The canonical reference for the parameter, without any qualifiers. E.g., my_param:27sa |
## Methods
| Method | Description |
|---|
parameter.create(*, values, type) | Create a new parameter within a workflow |
parameter.delete(*, values, type) | Delete a parameter |
parameter.get() | Fetches the parameter, after which parameter.properties will contain a dict with entries corresponding to the properties on the parameter resource definition. Will raise an error if the parameter does not exist. |
parameter.get_values() | Fetches the list of values associated with the parameter. |
parameter.exists() | Check whether the parameter exists. |
parameter.update([*, name, values, type]) | Update the parameter's name, values, and/or type. |
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