pandas.errors.PerformanceWarning#
- exception pandas.errors.PerformanceWarning[source]#
Warning raised when there is a possible performance impact.
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