change a attribute in dataframe
C
df = pd.DataFrame({'A': [1, 2, 3],
'B': [400, 500, 600]})
new_df = pd.DataFrame({'B': [4, 5, 6],
'C': [7, 8, 9]})
df.update(new_df)
df
A B
0 1 4
1 2 5
2 3 6
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