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DataHub

Hello Team, we are wondering that is there anyway to *Add Documentation for dataset* by using Python script (like Python Emitter) ?

you can refer to this file in the repo:
<https://github.com/linkedin/datahub/blob/master/metadata-ingestion/examples/mce_files/bootstrap_mce.json>

and look for line158, there is an aspect that deals with adding urls.

Yes there is! You'd have to update the "description" field of the DatasetProperties aspect using the Python Emitter API

```# Construct a dataset properties object.
dataset_properties = DatasetProperties(description="My new description", properties={..custom properties})

# Construct a MetadataChangeProposalWrapper object.
properties_mcp = MetadataChangeProposalWrapper(
    entityType="dataset",
    changeType=ChangeTypeClass.UPSERT,
    entityUrn=builder.make_dataset_urn("bigquery", "my-bigquery-table-id"),
    aspectName="datasetProperties",
    aspect=dataset_properties,
)```

<@U01GCJKA8P9>, this actually overwrites all the existing properties. Looks like the UPSERT is for the whole  ‘datasetProperties’ aspects and not for individual property key. Is there a way to individually update a property value ?  Also do you know how I can read existing properties as a key/value pair ?

I wonder if we have a solution for that already :smile: I mean, not overwrite the entire `datasetProperties` , but rather append a new key or update an existing key.