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# ask-community
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Xiaotian Yu

02/12/2023, 2:20 PM
Hi, I'm reading the docs (https://docs.dagster.io/concepts/io-management/io-managers#asset-input-io-managers). Seems that
pandas_series_io_manager
is not pre-defined, is that true? (background: I'm trying to define something like reading/writing to parquet files on disk instead of default pickle)
o

owen

02/13/2023, 5:48 PM
hi @Xiaotian Yu! you're correct that it is not predefined, you'd want to implement your own custom logic there
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