Appending Data to DataFrames

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  • Pandas

    Flexible and powerful data analysis / manipulation library for Python, providing labeled data structures similar to R data.frame objects, statistical functions, and much more

    Dataframes are not meant to be as flexible as lists in terms of extending the data they hold, dataframes are much more "deliberate". Ideally if you're trying to dynamically add data to a dataframe you should first collect all the data and then initialize the dataframe once. Or collect separate dataframes and concat them once. The pandas developers are even thinking about deprecating append (see here)

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