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Some exception objects carry additional fields. For example, a subprocess.CalledProcessError() exception carries returncode, output (the stdout), stderr, etc. It’s useful information, but self.fo...

posted 10d ago by Nick Alexeev‭ · edited 10d ago by Nick Alexeev‭

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#2: Post edited by

Nick Alexeev‭ · 2026-09-07T02:09:49Z (10 days ago)

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Some exception objects carry additional fields. For example, a `subprocess.CalledProcessError()` exception carries `returncode`, `output` (the stdout), `stderr`, etc. It’s useful information, but self.formatException() ignores it. You can add a few lines which format the extra fields, and save them as JSON next to the common exception data.
~~```~~
def format(self, record) -> str:
log_record_dict = { "time": self.formatTime(record), "level": record.levelname, "message": record.message }
if record.exc_info is not None:
_, exc_value, _ = record.exc_info
log_record_dict.update(vars(exc_value)) # <-- log the extra fields
log_record_dict["exception"] = self.formatException(record.exc_info)
log_record_dict.update(record.args)
return json.dumps(log_record_dict, indent=None)
```

Some exception objects carry additional fields. For example, a `subprocess.CalledProcessError()` exception carries `returncode`, `output` (the stdout), `stderr`, etc. It’s useful information, but self.formatException() ignores it. You can add a few lines which format the extra fields, and save them as JSON next to the common exception data.
``` python
def format(self, record) -> str:
log_record_dict = { "time": self.formatTime(record), "level": record.levelname, "message": record.message }
if record.exc_info is not None:
_, exc_value, _ = record.exc_info
log_record_dict.update(vars(exc_value)) # <-- log the extra fields
log_record_dict["exception"] = self.formatException(record.exc_info)
log_record_dict.update(record.args)
return json.dumps(log_record_dict, indent=None)
```

#1: Initial revision by

Nick Alexeev‭ · 2026-09-07T02:09:20Z (10 days ago)

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Some exception objects carry additional fields.  For example, a `subprocess.CalledProcessError()` exception carries `returncode`, `output` (the stdout), `stderr`, etc.  It’s useful information, but self.formatException() ignores it.  You can add a few lines which format the extra fields, and save them as JSON next to the common exception data.

```
def format(self, record) -> str:
    log_record_dict = { "time": self.formatTime(record), "level": record.levelname, "message": record.message }

    if record.exc_info is not None:
        _, exc_value, _ = record.exc_info
        log_record_dict.update(vars(exc_value))    # <-- log the extra fields
        log_record_dict["exception"] = self.formatException(record.exc_info)
    
    log_record_dict.update(record.args)
    return json.dumps(log_record_dict, indent=None)
```

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