settingwithcopywarning pandas
import pandas as pd
pd.options.mode.chained_assignment = None # default='warn'
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3.8
5
>>> df = pd.DataFrame(data=data, index=index)
>>> df.loc[mask, "z"] = 0
>>> df
x y z
a 1 1 0
b 2 3 98
c 4 9 0
d 8 27 0
e 16 81 64
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5
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