hello_world.py

from dagster import solid, pipeline, RepositoryDefinition

@solid
def hello_world_solid(context):
    context.log.info('Hello, World!')

@pipeline
def hello_world_pipeline():
    hello_world_solid() # DSL for building dependency graph
    
def define_hello_world_repo():
    return RepositoryDefinition(
        name='hello_world_repo',
        pipeline_defs=[hello_world_pipeline]
    )