我不知道为什么我会收到密钥错误：'Tested On'
msft = pd.read_csv("C:\\Users\\gomat\\Desktop\\Py TR\\week_06.csv")
msft['Tested On'] = pd.to_datetime(msft['Tested On'],dayfirst =True)
msft = msft[msft['Tested On'].dt.floor('d') == '2018-06-02']
样本数据：
| Plan | Run | Status | Tested On |
|------|----------|----------------|------------|
| P0 | Agent | Passed | 2018-08-11 |
| | Customer | Failed | 2018-08-01 |
| P1 | A | Passed | 2018-08-02 |
| | B | Untested | 2018-08-11 |
| P2 | C | Not Applicable | 2018-08-05 |