python data frame_python dataframe选择满足某条件的行,进行操作

python dataframe选择满足某条件的行,进行操作

发布时间:2018-11-27 23:29,

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python

dataframe

import pandas as pd data = {'state':['Ohio','Ohio','Merry','Nevaio','Nevada'],

'year':[2000,2001,2002,2001,2002], 'pop':[1.5,1.7,3.6,2.4,2.9] } frame =

pd.DataFrame(data,columns=['year','state','pop','debt'],index=['one','two','three','four','five'])

frame

数据如上图所示,现找出state中'state'列中含有字符'io'的行,将其的debt列赋值为'aa',实现代码如下:

frame.ix[frame['state'].str.contains('io'),['debt']] = 'aa' frame

现找出state中'state'列中等于‘Ohio’行,将其的debt列赋值为'aa',frame还是开头定义的,实现代码如下:

frame.ix[frame

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