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a guest Jun 19th, 2019 62 Never
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  1. import pandas as pd
  2. d={'name':['edward','margaret'],'sex':['male','female'],'amt':[100,200]}
  3.  
  4. df=pd.DataFrame(data=d)
  5.      
  6. df.loc[df['sex']=='female','amt']=-200
  7.      
  8. df.loc[df['sex']=='female','amt'] *= -1
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