如何在 pandas.DataFrame 中将“对象/字符串”类型转换为“时间”类型？

Question

I'm trying to convert the data-type of the time column in my dataset.

I found the below command using pandas from here only but while executing I'm getting the date as well in the pre-defined format for all the cells.

d2['Time of Card Posting']=pd.to_datetime(d2['Time of Card Posting'],format='%H:%M:%S')

PS: I tried the following command as well to extract time from it but it changes the data-type back to object!

d2['Time of Card Posting']=pd.to_datetime(d2['Time of Card Posting'],format='%H:%M:%S').dt.time

Answer 1

I would do it this way, if you just want the time:

import pandas as pd

d2 = pd.date_range(
    "2018-01-01", periods=5, freq="H", name="Time of Card Posting"
).to_frame()

d2_new = d2.assign(
    time=lambda x: (
        pd.to_datetime(x["Time of Card Posting"], format="%H:%M:%S").astype(str)
    ).str[-8:]
)