How to find the line that is generating a Pandas SettingWithCopyWarning?
Set pd.options.mode.chained_assignment = 'raise'
This will throw an exception pointing to the line which triggers SettingWithCopyError.
UPDATE: how to catch the error, and interrogate the stacktrace to get the actual offending lineno:
import pandas as pdfrom inspect import currentframe, getframeinfofrom pandas.core.common import SettingWithCopyErrorpd.options.mode.chained_assignment = 'raise'df = pd.DataFrame({'a': [1, 2, 3], 'b': [4, 5, 6]})df2 = df[df['a'] == 2]try: df2['b'] = 'foo'except SettingWithCopyError: print('handling..') frameinfo = getframeinfo(currentframe()) print(frameinfo.lineno)