从 timedelta 索引中删除天数？

Question

I have a dataframe df1 with index:

0 days 11:45:39
0 days 11:45:39
0 days 12:45:39

However, I am trying to remove the days portion of this. Is there a way to do this? The dtype of index currently is timedelta

Answer 1

There's always the option of formatting it as a string, if all you want to do is use it for plotting labels:

# if the index is a string,
# df.index = pd.to_timedelta(df.index, errors='coerce')
(pd.to_datetime('2020') + df.index).strftime('%H:%M:%S')
# Index(['11:45:39', '11:45:39', '12:45:39'], dtype='object', name='delta')

---

Another option using the power of list comprehensions:

[str(dt) for dt in  df.index.to_pytimedelta()]
# ['11:45:39', '11:45:39', '12:45:39']