https://twitter.com/arc279/status/1057516667717201921

a.dig

+t1:
  py>: a.ok
  arg1: 111

+t2:
  py>: a.ng
  arg1: 111
  arg2: 222

a.py

def ok(arg1, arg2=2, arg3=3):
    print(arg1, arg2, arg3)

def ng(arg1, arg2, arg3=3):
    print(arg1, arg2, arg3)

stdout

2018-10-31 15:24:31 +0900 [WARN] (main) io.digdag.cli.Run: Reusing the last session time 2018-10-17T00:00:00+00:00.
2018-10-31 15:24:31 +0900 [INFO] (main) io.digdag.cli.Run: Using session /Users/kuryu/workspace/digdag/.digdag/status/20181017T000000+0000.
2018-10-31 15:24:31 +0900 [INFO] (main) io.digdag.core.workflow.WorkflowExecutor: Starting a new session project id=1 workflow name=a session_time=2018-10-17T00:00:00+00:00
2018-10-31 15:24:32 +0900 [INFO] (0017@[0:default]+a+t1) io.digdag.core.agent.OperatorManager: py>: a.ok
2018-10-31 15:24:32 +0900 [WARN] (0017@[0:default]+a+t1) io.digdag.cli.Run$OperatorManagerWithSkip: 
  timezone: "UTC"
  session_uuid: "f2650fc9-3c02-4812-b37d-077310e67665"
  session_time: "2018-10-17T00:00:00+00:00"
  session_id: 1
  session_date: "2018-10-17"
  session_date_compact: "20181017"
  session_local_time: "2018-10-17 00:00:00"
  session_tz_offset: "+0000"
  session_unixtime: 1539734400
  last_executed_session_time: ""
  last_executed_session_date: ""
  last_executed_session_date_compact: ""
  last_executed_session_local_time: ""
  last_executed_session_tz_offset: "+0000"
  last_executed_session_unixtime: ""
  project_id: 1
  task_name: "+a+t1"
  py>: "a.ok"
  arg1: 111
  _type: "py"
  _command: "a.ok"

111 2 3
2018-10-31 15:24:33 +0900 [INFO] (0017@[0:default]+a+t2) io.digdag.core.agent.OperatorManager: py>: a.ng
2018-10-31 15:24:33 +0900 [WARN] (0017@[0:default]+a+t2) io.digdag.cli.Run$OperatorManagerWithSkip: 
  timezone: "UTC"
  session_uuid: "f2650fc9-3c02-4812-b37d-077310e67665"
  session_time: "2018-10-17T00:00:00+00:00"
  session_id: 1
  session_date: "2018-10-17"
  session_date_compact: "20181017"
  session_local_time: "2018-10-17 00:00:00"
  session_tz_offset: "+0000"
  session_unixtime: 1539734400
  last_executed_session_time: ""
  last_executed_session_date: ""
  last_executed_session_date_compact: ""
  last_executed_session_local_time: ""
  last_executed_session_tz_offset: "+0000"
  last_executed_session_unixtime: ""
  project_id: 1
  task_name: "+a+t2"
  py>: "a.ng"
  arg1: 111
  arg2: 222
  _type: "py"
  _command: "a.ng"

Traceback (most recent call last):
  File "<stdin>", line 147, in <module>
  File "<stdin>", line 129, in digdag_inspect_arguments
TypeError: Method 'ng' requires parameter 'arg3' but not set
2018-10-31 15:24:33 +0900 [ERROR] (0017@[0:default]+a+t2) io.digdag.core.agent.OperatorManager: Task failed with unexpected error: Python command failed with code 1
java.lang.RuntimeException: Python command failed with code 1
	at io.digdag.standards.operator.PyOperatorFactory$PyOperator.runCode(PyOperatorFactory.java:153)
	at io.digdag.standards.operator.PyOperatorFactory$PyOperator.runTask(PyOperatorFactory.java:91)
	at io.digdag.util.BaseOperator.run(BaseOperator.java:35)
	at io.digdag.core.agent.OperatorManager.callExecutor(OperatorManager.java:312)
	at io.digdag.cli.Run$OperatorManagerWithSkip.callExecutor(Run.java:694)
	at io.digdag.core.agent.OperatorManager.runWithWorkspace(OperatorManager.java:254)
	at io.digdag.core.agent.OperatorManager.lambda$runWithHeartbeat$2(OperatorManager.java:137)
	at io.digdag.core.agent.LocalWorkspaceManager.withExtractedArchive(LocalWorkspaceManager.java:25)
	at io.digdag.core.agent.OperatorManager.runWithHeartbeat(OperatorManager.java:135)
	at io.digdag.core.agent.OperatorManager.run(OperatorManager.java:119)
	at io.digdag.cli.Run$OperatorManagerWithSkip.run(Run.java:676)
	at io.digdag.core.agent.MultiThreadAgent.lambda$null$0(MultiThreadAgent.java:127)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
2018-10-31 15:24:33 +0900 [INFO] (0017@[0:default]+a^failure-alert) io.digdag.core.agent.OperatorManager: type: notify
2018-10-31 15:24:33 +0900 [WARN] (0017@[0:default]+a^failure-alert) io.digdag.cli.Run$OperatorManagerWithSkip: 
  timezone: "UTC"
  session_uuid: "f2650fc9-3c02-4812-b37d-077310e67665"
  session_time: "2018-10-17T00:00:00+00:00"
  session_id: 1
  session_date: "2018-10-17"
  session_date_compact: "20181017"
  session_local_time: "2018-10-17 00:00:00"
  session_tz_offset: "+0000"
  session_unixtime: 1539734400
  last_executed_session_time: ""
  last_executed_session_date: ""
  last_executed_session_date_compact: ""
  last_executed_session_local_time: ""
  last_executed_session_tz_offset: "+0000"
  last_executed_session_unixtime: ""
  project_id: 1
  task_name: "+a^failure-alert"
  _type: "notify"
  _command: "Workflow session attempt failed"