AI engineering glossary · NumPy pandas visualization
What is settingWithCopyWarning?
SettingWithCopyWarning (also called chained assignment): A pandas warning raised when you assign into something that may be a temporary copy of a slice rather than the original table, so the change may be lost. It is avoided by using loc for assignment or by making an explicit copy.
SettingWithCopyWarning: an example
df[df['age'] > 30]['flag'] = 1 may not change df; df.loc[df['age'] > 30, 'flag'] = 1 does.
Related terms
More NumPy pandas visualization terms
Where you learn it
SettingWithCopyWarning is part of the AI Engineering Program, which teaches it with notes, a hands-on lab and an exam. The first lesson is free.