#questions
Title
# questions
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Emilio Gagliardi
09/13/2023, 9:59 PMhi everyone, I have an easy question! 🙂 when I create a pandas CSV dataset, is it possible to append to the file or only write out the entire file? I just want to append a new row of data each time the pipeline runs, but currently it just overwrites the first line every time. I thought maybe I could set the mode="a" in catalog but that didn't seem to have an effect. I tried to load the csv by passing the dataset to the node in the pipeline inputs but that caused an error. what am I missing here? cheers!
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datajoely
09/13/2023, 10:00 PM Copy code
save_args:
mode: ae
Emilio Gagliardi
09/13/2023, 10:02 PMI had
Copy code
save_args:
mode: 'a'no change, the csv file just contains a single row from the latest run.
Copy code
validation_metrics:
type: pandas.CSVDataSet
filepath: "data/08_reporting/validation_metrics.csv"
load_args:
save_args:
index: False
na_rep: "NaN"
mode: a Copy code
new_data_dict = {...} <- a single dictionary
new_data_df = pd.DataFrame([new_data_dict])
return new_data_dfj
Juan Luis
09/14/2023, 8:41 AMI tried this locally and it overrides the file for me too. @Emilio Gagliardi I'm opening an issue about this
@Emilio Gagliardi please upvote https://github.com/kedro-org/kedro-plugins/issues/336 (reacting with 👍🏼 ) and/or add any extra context that might help us prioritize the issue
in the meantime, do Incremental datasets https://docs.kedro.org/en/stable/data/partitioned_and_incremental_datasets.html#incremental-datasets suit your needs?
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Emilio Gagliardi
09/14/2023, 7:36 PMThank you, @Juan Luis! I just added a comment and a thumbs up. I haven't used an incremental dataset before, I'm not sure if it works. I just manually opened the CSV file and wrote to it.
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