python 重命名轴索引的方法

如下所示：

import numpy as np
from pandas import series, dataframe
###重命名轴索引
data = dataframe(np.arange(12).reshape((3, 4)),
     index=['ohio', 'colorado', 'new york'],
     columns=['one', 'two', 'three', 'four'])
 
print( data.index.map(str.upper) ) #['ohio' 'colorado' 'new york']
 
data.index = data.index.map(str.upper)
print( data )
'''
   one two three four
ohio  0 1  2  3
colorado 4 5  6  7
new york 8 9  10 11
'''
 
data_2 = data.rename(index=str.title, columns=str.upper)
print( data_2 )
'''
   one two three four
ohio  0 1  2  3
colorado 4 5  6  7
new york 8 9  10 11
'''
data_3 = data.rename(index={'ohio': 'indiana'},
   columns={'three': 'peekaboo'})
print( data_3 )
'''
   one two peekaboo four
indiana  0 1   2  3
colorado 4 5   6  7
new york 8 9  10 11
'''
 
# 总是返回dataframe的引用
_ = data.rename(index={'ohio': 'indiana'}, inplace=true)
print( _ ) # none

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