Adding __repr__ to WorkflowStep, WorkflowJob, and WorkflowJobStep classes. This can be VERY helpful while debugging, particularly when unraveling callback chains.

Author: AlexTate

cwltool/workflow.py

@@ -1,3 +1,4 @@
+import os
 import copy
 import datetime
 import functools
@@ -452,3 +453,6 @@ def job(
 
     def visit(self, op: Callable[[CommentedMap], None]) -> None:
         self.embedded_tool.visit(op)
+
+    def __repr__(self):
+        return f"<{self.__class__.__name__} [{os.path.basename(self.id)}]>"

cwltool/workflow_job.py

@@ -66,6 +66,9 @@ def job(
 
         yield from self.step.job(joborder, output_callback, runtimeContext)
 
+    def __repr__(self):
+        return f"<{self.__class__.__name__} [{self.name}]>"
+
 
 class ReceiveScatterOutput:
     """Produced by the scatter generators."""
@@ -851,6 +854,8 @@ def job(
             # depends which one comes first. All steps are completed
             # or all outputs have been produced.
 
+    def __repr__(self):
+        return f"<{self.__class__.__name__} [{self.name}]>"
 
 class WorkflowJobLoopStep:
     """Generated for each step in Workflow.steps() containing a `loop` directive."""