pythonpandaswarningssuppress-warnings

How to ignore SettingWithCopyWarning using warnings.simplefilter()?

The question:

Can I ignore or prevent the SettingWithCopyWarning to be printed to the console using warnings.simplefilter()?

The details:

I'm running a few data cleaning routines using pandas, and those are executed in the simplest of ways using a batch file. One of the lines in my Python script triggers the SettingWithCopyWarning and is printed to the console. But it's also being echoed in the command prompt:

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Aside from sorting out the source of the error, is there any way I can prevent the error message from being printed to the prompt like I can with FutureWarnings like warnings.simplefilter(action = "ignore", category = FutureWarning)?

Solution

  • Though I would strongly advise to fix the issue, it is possible to suppress the warning by importing it from pandas.core.common. I found where it's located on GitHub.

    Example:

    import warnings

import pandas as pd
from pandas.core.common import SettingWithCopyWarning

warnings.simplefilter(action="ignore", category=SettingWithCopyWarning)

df = pd.DataFrame(dict(A=[1, 2, 3], B=[2, 3, 4]))
df[df['A'] > 2]['B'] = 5  # No warnings for the chained assignment!