Question

I have a initial dataframe D. I extract two data frames from it like this:

A = D[D.label == k]
B = D[D.label != k]

I want to combine A and B into one DataFrame. The order of the data is not important. However, when we sample A and B from D, they retain their indexes from D.

Answer 1

DEPRECATED: DataFrame.append and Series.append were deprecated in v1.4.0.

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Use append:

df_merged = df1.append(df2, ignore_index=True)

And to keep their indexes, set ignore_index=False.