Run your python program with the -X importtime option, available since Python 3.7. The program will output timing statistics on stderr : import time: self [us] | cumulative | imported package import ...

You could waste time figuring out how to do it yourself ... Simply create a new .py file in the same folder as your main Python code. Then “import” that file as you now know how to do ...

i.e. overload or extend import processing for particular file types, without affecting processing of other file types, and at the same time, while ensuring that new processing integrates as seamlessly ...

As POSIX time does not handle leap seconds (nor does Python), some companies have defined their own way of handling time by smearing the leap second across the time around it through their NTP ...