python / pandas / dataframe / How to get the simplest row / column / index / column

df = pd.DataFrame([
    ['a0','b0','c0'],
    ['a1','b1','c1'],
    ['a2','b2','c2'],
    ['a3','b3','c3'],
], 
    columns=['a','b','c'],
    index=[0,1,2,3]
)
df

#Case using loc
df.loc[[0,2],['a','c']]
#Case using iloc
df.iloc[[0,2],[0,2]]

df.index

df.columns

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