python 重命名轴索引的方法
如下所示：
importnumpyasnp
frompandasimportSeries,DataFrame
###重命名轴索引
data=DataFrame(np.arange(12).reshape((3,4)),
index=['Ohio','Colorado','NewYork'],
columns=['one','two','three','four'])
print(data.index.map(str.upper))#['OHIO''COLORADO''NEWYORK']
data.index=data.index.map(str.upper)
print(data)
'''
onetwothreefour
OHIO0123
COLORADO4567
NEWYORK891011
'''
data_2=data.rename(index=str.title,columns=str.upper)
print(data_2)
'''
ONETWOTHREEFOUR
Ohio0123
Colorado4567
NewYork891011
'''
data_3=data.rename(index={'OHIO':'INDIANA'},
columns={'three':'peekaboo'})
print(data_3)
'''
onetwopeekaboofour
INDIANA0123
COLORADO4567
NEWYORK891011
'''
#总是返回DataFrame的引用
_=data.rename(index={'OHIO':'INDIANA'},inplace=True)
print(_)#None
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