python - Deleting rows in CSV files using Pandas -


relatively new pandas apologize in advance if redundant. have sorted data in csv file, delete rows no longer need. example here, keep rows trade date , settle date same delete rows different. 

trade date      settle date     security  8/15/2017         8/15/2017           9/7/2017            9/11/2017          b 8/31/2017          9/6/2017            c

i guessing need add true false booleans code used try did not seem work me. appreciated.

booleans=[] length in df_new:     if 'trade date'=='settle date':     booleans.append(true) else:    booleans.append(false) 

df = df[df['trade date'] == df['settle date']] df    trade date settle date security 0  8/15/2017   8/15/2017

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