Don't serialize some options to json (#1097)

Debug a serialization failure

histomicstk/cli/SuperpixelSegmentation/SuperpixelSegmentation.py

@@ -237,7 +237,7 @@ def createSuperPixels(opts): # noqa
  'boundaries': opts.boundaries,
  }],
  'attributes': {
- 'params': vars(opts),
+ 'params': {k: v for k, v in vars(opts).items() if not callable(v)},
  'cli': Path(__file__).stem,
  'version': histomicstk.__version__,
  },
@@ -259,14 +259,19 @@ def createSuperPixels(opts): # noqa
  'lineColor': opts.default_strokeColor,
  } for bidx, (bcx, bcy, bw, bh) in enumerate(bboxes)],
  'attributes': {
- 'params': vars(opts),
+ 'params': {k: v for k, v in vars(opts).items() if not callable(v)},
  'cli': Path(__file__).stem,
  'version': histomicstk.__version__,
  },
  }
  annotation = [annotation, bboxannotation]
  with open(opts.outputAnnotationFile, 'w') as annotation_file:
- json.dump(annotation, annotation_file, separators=(',', ':'), sort_keys=False)
+ try:
+ json.dump(annotation, annotation_file, separators=(',', ':'), sort_keys=False)
+ except Exception:
+ print('Failed to serialize annotation')
+ print(repr(annotation))
+ raise
  if hasattr(opts, 'callback'):
  opts.callback('file', 2, 2)