日期时间数据类型是对象而不是日期时间

Datetime dtype is Object not Datetime

我的意思是按时间戳分组。首先,我必须将我得到的时间(字符串)转换为日期时间。将其转换为日期时间后,我注意到尽管给出了 pandas 添加日期的特定格式,但我不需要日期。我正在努力删除它并只保留时间对象,但我没有成功。我所做的任何删除日期 returns 的 dtype 到我无法对其进行分组的对象。

示例数据:

https://miratrix.co.uk/          00:01:55
https://miratrix.co.uk/          00:02:02
https://miratrix.co.uk/          00:02:45
https://miratrix.co.uk/          00:01:22
https://miratrix.co.uk/          00:02:02
https://miratrix.co.uk/app-marketing-agency/          00:02:23
https://miratrix.co.uk/get-in-touch/          00:02:26
https://miratrix.co.uk/get-in-touch/          00:00:18
https://miratrix.co.uk/get-in-touch/          00:02:37
https://miratrix.co.uk/          00:00:31
https://miratrix.co.uk/          00:02:00
https://miratrix.co.uk/app-store-optimization-...          00:02:25
https://miratrix.co.uk/          00:03:36
https://miratrix.co.uk/app-marketing-agency/          00:02:09
https://miratrix.co.uk/get-in-touch/          00:02:14
https://?page_id=16198/          00:00:15
https://videos/channel/UCAQfRNzXGD4BQICkO1KQZUA/          00:09:07
https://miratrix.co.uk/get-in-touch/          00:01:39
https://miratrix.co.uk/app-marketing-agency/          00:01:07

到目前为止我尝试了什么

*Returned Object*
ga_organic['NEW Avg. Time on Page'] = pd.to_datetime(ga_organic['Avg. Time on Page'], format="%H:%M:%S").dt.time

*Returned Datetime but when trying to sample only time it returned an object*
ga_organic['NEW Avg. Time on Page'] = ga_organic['Avg. Time on Page'].astype('datetime64[ns]')

ga_organic['NEW Avg. Time on Page'].dt.time

我感觉有一些我不知道的关于日期时间的东西,这就是我遇到这个问题的原因。欢迎任何帮助或指导。

####更新####

感谢ALollz提供时间戳的解决方案

ga_organic['NEW Avg. Time on Page'] = pd.to_timedelta(ga_organic['Avg. Time on Page'])

然而,当我使用这种方法使用 GroupBy 时,我仍然遇到同样的错误:

avg_time = ga_organic.groupby(ga_organic.index)['NEW Avg. Time on Page'].mean()

错误:"DataError: No numeric types to aggregate"

是否有处理分组日期时间的特定函数?

似乎 groupby 无法将 timedelta64 识别为数字类型。有几种解决方法,可以使用 numeric_only=False 或使用 total_seconds.

import pandas as pd

#df = pd.read_clipboard(header=None)
#df[1] = pd.to_timedelta(df[1])

df.groupby(df.index//2)[1].mean()
#DataError: No numeric types to aggregate

# To fix pass `numeric_only=False`
df.groupby(df.index//2)[1].mean(numeric_only=False)
#0   00:01:58.500000
#1   00:02:03.500000
#2   00:02:12.500000
#3          00:01:22
#4          00:01:34
#5   00:02:12.500000
#6   00:02:52.500000
#7   00:01:14.500000
#8          00:05:23
#9          00:01:07
#Name: 1, dtype: timedelta64[ns]

使用简单的 float.total_seconds:

df[1] = df[1].dt.total_seconds()

df.groupby(df.index//2)[1].mean()
#0    118.5
#1    123.5
#2    132.5
#3     82.0
#4     94.0
#5    132.5
#6    172.5
#7     74.5
#8    323.0
#9     67.0
#Name: 1, dtype: float64

这可以通过 pd.to_timedelta 指定 unit='s'

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