ValueError: Circular reference detected

05-14-2023 01:35 PM
Occasional Contributor


I am getting this error : ValueError: Circular reference detected when I run this code. Does someone have an idea how to solve this?


from arcgis import geometry #use geometry module to project Long,Lat to X and Y
from copy import deepcopy

for Project in overlap_rows['Project']:
# get the feature to be updated
original_feature = [f for f in all_features if f.attributes['Project'] == Project][0]
feature_to_be_updated = deepcopy(original_feature)

# get the matching row from csv
matching_row = PB1_df[PB1_df['Project'] == Project].iloc[0]

#get geometries in the destination coordinate system
#input_geometry = {'y':float(matching_row['latitude']),
#output_geometry = geometry.project(geometries = [input_geometry],
# in_sr = 4326,
# out_sr = cities_fset.spatial_reference['latestWkid'],
# gis = gis)

# assign the updated values
#feature_to_be_updated.attributes['FID'] = int(matching_row['FID'])
#feature_to_be_updated.attributes['Begindatum'] = (matching_row['Begindatum'])
#feature_to_be_updated.attributes['Einddatum'] = (matching_row['Einddatum'])
feature_to_be_updated.attributes['Duur'] = int(matching_row['Duur'])
feature_to_be_updated.attributes['Status'] = str(matching_row['Status'])
#feature_to_be_updated.attributes['Taaknaam'] = str(matching_row['Taaknaam'])
#feature_to_be_updated.attributes['Werkzaamheden'] = str(matching_row['Werkzaamheden'])
#feature_to_be_updated.attributes['Latitude'] = (matching_row['Latitude'])
#feature_to_be_updated.attributes['Longitude'] = (matching_row['Longitude'])

#add this to the list of features to be updated


WZ1_flayer.edit_features(updates = features_for_update)




This is the message with error: 

ValueError                                Traceback (most recent call last)
Input In [101], in <cell line: 1>()
----> 1 WZ1_flayer.edit_features(updates = features_for_update)

File /opt/conda/lib/python3.9/site-packages/arcgis/features/, in FeatureLayer.edit_features(self, adds, updates, deletes, gdb_version, use_global_ids, rollback_on_failure, return_edit_moment, attachments, true_curve_client, session_id, use_previous_moment, datum_transformation, future)
   2875     params["updates"] = json.dumps(
   2876         [dict(f) for f in updates], default=_date_handler
   2877     )
   2878 elif isinstance(updates[0], Feature):
-> 2879     params["updates"] = json.dumps(
   2880         [f.as_dict for f in updates], default=_date_handler
   2881     )
   2882 else:
   2883     print("pass in features as list of Features, dicts or PropertyMap")

File /opt/conda/lib/python3.9/json/, in dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, cls, indent, separators, default, sort_keys, **kw)
    232 if cls is None:
    233     cls = JSONEncoder
--> 234 return cls(
    235     skipkeys=skipkeys, ensure_ascii=ensure_ascii,
    236     check_circular=check_circular, allow_nan=allow_nan, indent=indent,
    237     separators=separators, default=default, sort_keys=sort_keys,
    238     **kw).encode(obj)

File /opt/conda/lib/python3.9/json/, in JSONEncoder.encode(self, o)
    195         return encode_basestring(o)
    196 # This doesn't pass the iterator directly to ''.join() because the
    197 # exceptions aren't as detailed.  The list call should be roughly
    198 # equivalent to the PySequence_Fast that ''.join() would do.
--> 199 chunks = self.iterencode(o, _one_shot=True)
    200 if not isinstance(chunks, (list, tuple)):
    201     chunks = list(chunks)

File /opt/conda/lib/python3.9/json/, in JSONEncoder.iterencode(self, o, _one_shot)
    252 else:
    253     _iterencode = _make_iterencode(
    254         markers, self.default, _encoder, self.indent, floatstr,
    255         self.key_separator, self.item_separator, self.sort_keys,
    256         self.skipkeys, _one_shot)
--> 257 return _iterencode(o, 0)

ValueError: Circular reference detected



0 Kudos
2 Replies
MVP Esteemed Contributor

Code formatting ... the Community Version - Esri Community

would help provide line numbers and proper indentation for those trying to look at the code

... sort of retired...
New Contributor II

I struck this myself recently; in my case, whitespace characters in two of the string fields were causing the issue.

Using the fillna and/or str.replace methods before updating any of the feature_to_be_updated.attributes could help.