How to convert duration strings to seconds?

I have such a column in a pandas dataframe:

duration
1 day 22:12:15.778543
2 days 10:09:07.118723
00:18:23.985112

I would like to convert this duration to seconds.

How can I do this? I am not sure if this is possible because of the special string format I got (1 day, 2 days etc.)?

>Solution :

Use to_timedelta with Series.dt.total_seconds:

df['s'] = pd.to_timedelta(df['duration']).dt.total_seconds()
print (df)
                 duration              s
0   1 day 22:12:15.778543  166335.778543
1  2 days 10:09:07.118723  209347.118723
2         00:18:23.985112    1103.985112