df.rename(index=str, columns={"A": "a", "C": "c"}) what does index=str means
>>> df.index
RangeIndex(start=0, stop=3, step=1)
>>> df.rename(index=str).index
Index(['0', '1', '2'], dtype='object')
df.rename(index=str, columns={"A": "a", "C": "c"}) what does index=str means
>>> df.index
RangeIndex(start=0, stop=3, step=1)
>>> df.rename(index=str).index
Index(['0', '1', '2'], dtype='object')
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