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When I try to access an element (expected to be of type 'list') of my DataFrame, It is considered as a string. Is the list type supported by dataiku or should we use only array type ?
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An "array" column in DSS will indeed show up as a json-encoded string in the dataframe. You can use json.loads to parse it in the dataframe.

The same rule applies when writing: you must json-encode the column before writing the dataframe to a DSS dataset.
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