Are there plans to support providing functions to compare only the fields that exist in both objects? #562

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1. chen56 commented on Jan 7, 2026

   

   chen56

   on Jan 7, 2026

   Last edited by chen56

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   @anfreshman

   I couldn't find any easy way to handle subset inclusion either. It seems that only include and exclude are applicable.

   like this code:

   from deepdiff import DeepDiff
   from deepdiff.helper import COLORED_VIEW
   
   
   def get_all_paths(d, current_path="root"):
       """get all paths from a nested dict or list"""
       paths = []
       if isinstance(d, dict):
           for k, v in d.items():
               new_path = f"{current_path}['{k}']"
               paths.extend(get_all_paths(v, new_path))
       elif isinstance(d, list):
           for i, v in enumerate(d):
               new_path = f"{current_path}[{i}]"
               paths.extend(get_all_paths(v, new_path))
       else:
           # leaf node（int, str, float...）
           paths.append(current_path)
       return paths
   
   
   subset = {"params": {"gpu": "A100", "memory": {"size": "64G"}}}
   full_set = {"params": {"gpu": "A100", "memory": {"size": "64G", "type": "HBM2"}}, "other": 1}
   
   print(f"get all leaf paths: {get_all_paths(subset)}")
   
   
   # get all leaf paths: ["root['params']['gpu']", "root['params']['memory']['size']"]
   
   def only_diff_subset(full_set: dict, subset_: dict):
       return DeepDiff(full_set, subset_, include_paths=get_all_paths(subset_), view=COLORED_VIEW)
   
   
   diff = only_diff_subset(full_set, subset)
   assert {} == diff, diff
   # ok
   
   diff = only_diff_subset(full_set, {"params": {"gpu": "XXX", "memory": {"size": "64G"}}})
   assert {} == diff, diff
   # Traceback (most recent call last):
   #   File "/Users/chen/git/chen56/applab_research/features/validation/diff/test_pycheck.py", line 39, in <module>
   #     assert {} == diff, diff
   #            ^^^^^^^^^^
   # AssertionError: {
   #   "params": {
   #     "gpu": "A100" -> "XXX",
   #     "memory": {
   #       "size": "64G"
   #     }
   #   }
   # }