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import numpy as np
import pandas as pd
from pandas import Series,DataFrame
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df = DataFrame(np.arange(12).reshape(3,4),
index=['NY','LA','SF'],
columns=['A','B','C','D'])
df
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df.index.map(str.lower)
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df
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df.index = df.index.map(str.lower)
df
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df.rename(index=str.title,columns=str.lower)
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df.rename(index={'ny':'New York'},columns={'A':'Alpha'})
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df
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df.rename(index={'ny':'New York'},columns={'A':'Alpha'},inplace=True)
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df
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