how to get the exact time in python code example

Example 1: how to print time python

import datetime
datetime.datetime.now()
datetime.datetime(2009, 1, 6, 15, 8, 24, 78915)

print(datetime.datetime.now())
#2009-01-06 15:08:24.789150

Example 2: use datetime python to get runtime

from datetime import datetime

start = datetime.now()
# code ...
print(datetime.now()-start)