pandas.errors.PerformanceWarning#

exceptionpandas.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