How to add a new column to a dataset

🤗Datasets
2

Hi ! You can use the add_column method:

from datasets import load_dataset

ds = load_dataset("cosmos_qa", split="train")

new_column = ["foo"] * len(ds)
ds = ds.add_column("new_column", new_column)

and you get a dataset

Dataset({
    features: ['id', 'context', 'question', 'answer0', 'answer1', 'answer2', 'answer3', 'label', 'new_column'],
    num_rows: 25262
})
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