trade = pd.DataFrame(self.trade)
option = pd.DataFrame(self.option)
trade = trade.append(option )
trade = trade.append(option )
# 求差集要append两次
diff = trade.drop_duplicates(subset=['LinkTradeCode', 'PutOrCall', 'KnockPrice', 'InstrumentType'], keep=False)dataframe 求差集
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