Python

df.drop(a_dataframe.columns[0], axis=1, inplace=True)

df.reset_index(drop=True, inplace=True)

df = df.reset_index(drop=True)

cols = [1,2,4,5,12]
df.drop(df.columns[cols],axis=1,inplace=True)

>>> df.reset_index(drop=True)
    class  max_speed
0    bird      389.0
1    bird       24.0
2  mammal       80.5
3  mammal        NaN

df = df.reset_index(drop=True)

df.set_index('id', inplace=True)

df.drop([0, 1])

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