replace assign with []= syntax to reduce copying #76
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pandas's df.assign(...) copies the entire dataframe, while using df[col] = ... syntax avoids copying everything. This reduces memory overhead significantly in calls to TimeSeriesDataFrame.toPandas().
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pandas's df.assign(...) copies the entire dataframe, while using df[col] = ... syntax avoids copying everything. This reduces memory overhead significantly in calls to TimeSeriesDataFrame.toPandas().