import csv
import os
import pandas as pd
os.chdir('C:\\Users\\khalha\\Desktop\\RealExcel')
filename = 'sales.csv'

Sales = pd.read_csv('sales.csv')
iFlow = Sales.loc[Sales['Product'].str.contains('Vector HF/LF (Opt 2)', 
na=False), "18-Jun"]
print(iFlow)

MaySales = pd.read_csv('maysales.csv')
iFlowmay = MaySales.loc[MaySales['Product'].str.contains('Vector HF/LF (Opt 
2)', na=False), "18-Jun"]
print(iFlowmay)

我得到错误消息：

C:\Users\khalha\eclipse-workspace\hariskk\hey\hello.py:8: UserWarning: This pattern has match groups. To actually get the groups, use str.extract.
  iFlow = Sales.loc[Sales['Product'].str.contains('Vector HF/LF (Opt 2)', na=False), "18-Jun"]
Series([], Name: 18-Jun, dtype: object)
C:\Users\khalha\eclipse-workspace\hariskk\hey\hello.py:12: UserWarning: This pattern has match groups. To actually get the groups, use str.extract.
  iFlowmay = MaySales.loc[MaySales['Product'].str.contains('Vector HF/LF (Opt 2)', na=False), "18-Jun"]
Series([], Name: 18-Jun, dtype: object)

这段代码处理第一个块，但是当我添加Maysales部分时，它停止工作。