Answers for "ettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead"

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SettingWithCopyWarning: A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead

import pandas as pd
pd.options.mode.chained_assignment = None  # default='warn'

Posted by: Guest on December-03-2020

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A value is trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead

df[df['A'] > 2]['B'] = new_val  # new_val not set in df
# rewrite it as below
df.loc[df['A'] > 2, 'B'] = new_val

Posted by: Guest on June-22-2021

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