python
from taskflow import task, flow, engine
class PrintTask(task.Task):
def execute(self, message):
print(message)
class AddTask(task.Task):
def execute(self, a, b):
return a + b
print_task = PrintTask()
add_task = AddTask()
flow_engine = engine.Engine()
print_task.message = "Hello, TaskFlow!"
add_task.a = 2
add_task.b = 3
flow_instance = flow.Flow("my_flow").add(print_task, add_task)
flow_engine.compile(flow_instance)
flow_engine.run()
