Resolved

subprocess run fails with stdout and capture_output conflict

Python
Subprocess
Debugging
Backend
Error Handling
Scripting

Python subprocess.run() throws 'stdout and stderr arguments may not be used with capture_output' error | Conflicting arguments in subprocess call cause runtime failure

Issue

An error occurred during the execution of system commands in the orchestrator component, where subprocess.run() raised a runtime conflict when attempting to capture output. The error message indicated that the stdout and stderr arguments could not be used simultaneously with capture_output.

Culprit

The issue arose from conflicting arguments in the subprocess.run() call. The capture_output=True parameter (a convenience flag introduced in Python 3.7) automatically configures stdout=subprocess.PIPE and stderr=subprocess.PIPE. However, explicitly specifying stderr=subprocess.PIPE alongside capture_output=True created an invalid argument combination, triggering the runtime error.

Solution

The redundant stderr=subprocess.PIPE argument was removed while retaining capture_output=True. This adjustment resolved the conflict without altering the intended functionality, as capture_output=True inherently captures both standard output and error streams. The fix ensures consistent behavior across Python versions and avoids argument conflicts in subprocess execution.