python 重命名轴索引的方法_Python

python 重命名轴索引的方法

2021-04-18 00:06CWS_chen Python

今天小编就为大家分享一篇python 重命名轴索引的方法，具有很好的参考价值，希望对大家有所帮助。一起跟随小编过来看看吧

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