为什么date-time会自动更改为object数据类型?

时间:2018-02-08 13:14:05

标签: python pandas excel-automation

需要将对象类型转换为日期时间,并使用转换后的日期时间在过滤时不知不觉地再次更改为对象。

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实际结果: TypeError:' NoneType'对象不可订阅

预期结果: 需要显示带有其他行和列的已过滤列表

1 个答案:

答案 0 :(得分:0)

我认为您需要to_datetime,如果第一个数字是天,则添加参数dayfirst=True

print (msft)
  Title plan     run   status           Tested On
0     A   P0      P0   Passed  11/08/2018 8:42 AM
1     B   P0      P0   Failed  12/08/2018 8:42 AM
2     C    -  Canary   Passed  10/08/2018 8:42 AM
3     D    -  Sanity  Blocked  11/08/2018 8:42 AM

msft['Tested On'] = pd.to_datetime(msft['Tested On'], dayfirst=True)
print (msft)
  Title plan     run   status           Tested On
0     A   P0      P0   Passed 2018-08-11 08:42:00
1     B   P0      P0   Failed 2018-08-12 08:42:00
2     C    -  Canary   Passed 2018-08-10 08:42:00
3     D    -  Sanity  Blocked 2018-08-11 08:42:00

然后按dt.floor删除时间并比较:

df = msft[msft['Tested On'].dt.floor('d') == '2018-08-11']
print (df)
  Title plan     run   status           Tested On
0     A   P0      P0   Passed 2018-08-11 08:42:00
3     D    -  Sanity  Blocked 2018-08-11 08:42:00

<强>详细

print (msft['Tested On'].dt.floor('d'))
0   2018-08-11
1   2018-08-12
2   2018-08-10
3   2018-08-11
Name: Tested On, dtype: datetime64[ns]