How Can I make this end_time = datetime.now()
in seconds only, 

I have a start_time = datetime.now() and a end_time datetime.now()

I want to find the difference in seconds. 

How can I do that in python.?

I have testet this: with start_time = datetime.now() and end_time = datetime.now()

start_time = 2016-06-30 07:15:26.273169

end_time = 2016-06-30 07:15:26.273153

Then I do a final_time = (end_time - start_time).total_seconds()

it give me this back:  float -1.6e-05

How can I convert this in hours and minutes?