import stepfunctions
from stepfunctions.workflow import Workflow
from stepfunctions.steps import *
workflow_execution_role = "<ENTER A VALID EXECUTION ROLE>"
hello_workflow_name='hello_workflow'
hello_step = Pass(state_id="HelloWorld")
# creating a demo workflow
hello_workflow = Workflow(
 name=hello_workflow_name, 
 definition=hello_step, 
 role=workflow_execution_role
)
hello_workflow_arn = hello_workflow.create()
# now trying to update the existing workflow with tags
hello_workflow_update = Workflow(
 name=hello_workflow_name, 
 definition=hello_step, 
 role=workflow_execution_role,
 state_machine_arn = hello_workflow_arn,
 tags=[
 {"key": "Environment", "value": 'example'},
 {"key": "Owner", "value": 'Lasdem'},
 ]
)
hello_workflow_update.update(hello_step)