#线损率=(供入电量-供出电量)/供入电量*100%
#线损率属性构造
import pandas as pd

inputfile='../data/electricity_data.xls'
outputfile='../tmp/electricity_data.xls'

data=pd.read_excel(inputfile)
data[u'线损率']=(-data[u'供出电量'])/data[u'供入电量']

data.to_excel(outputfile,index=False)