![]() indicator : Add a column to the output DataFrame called _merge with information on the source of each row.The cases where copying can be avoided are somewhat pathological but this option is provided nonetheless. ![]() Cannot be avoided in many cases but may improve performance and memory usage. copy : Always copy data (default True) from the passed DataFrame or named Series objects, even when reindexing is not necessary.suffixes : A tuple of string suffixes to apply to overlapping columns.Defaults to True setting to False will improve performance substantially in many cases. sort : Sort the result DataFrame by the join keys in lexicographical order.See below for more detailed description of each method. how : One of left, right, ' outer, or inner.right_index : Same usage as left_index for the right DataFrame or Series.In the case of a DataFrame or Series with a MultiIndex (hierarchical), the number of levels must match the number of join keys from the right DataFrame or Series. left_index : If True, use the index (row labels) from the left DataFrame or Series as its join key(s).Can either be column names, index level names, or arrays with length equal to the length of the DataFrame or Series. right_on : Columns or index levels from the right DataFrame or Series to use as keys. ![]()
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