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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QianYanDai 2020-01-07