pandas.errors.PerformanceWarning — pandas 3.0.0.dev0+2105.g29e01463a6 documentation (original) (raw)

exception pandas.errors.PerformanceWarning[source]#

Warning raised when there is a possible performance impact.

See also

DataFrame.set_index

Set the DataFrame index using existing columns.

DataFrame.loc

Access a group of rows and columns by label(s) or a boolean array.

Examples

df = pd.DataFrame( ... {"jim": [0, 0, 1, 1], "joe": ["x", "x", "z", "y"], "jolie": [1, 2, 3, 4]} ... ) df = df.set_index(["jim", "joe"]) df jolie jim joe 0 x 1 x 2 1 z 3 y 4 df.loc[(1, "z")]

PerformanceWarning: indexing past lexsort depth may impact performance.

df.loc[(1, 'z')] jolie jim joe 1 z 3