The running time from the start of the python computing program to the end of the program and the CPU time of the program running

Execution time

Method 1
Copy codeThe Code is as follows:
Import datetime
Starttime = datetime. datetime. now ()
# Long running
Endtime = datetime. datetime. now ()
Print (endtime-starttime). seconds

Method 2
Copy codeThe Code is as follows:
Start = time. time ()
Run_fun ()
End = time. time ()
Print end-start

Method 3
Copy codeThe Code is as follows:
Start = time. clock ()
Run_fun ()
End = time. clock ()
Print end-start

Methods 1 and 2 both contain the CPU usage time of other programs, which is the running time from program start to program end.
Method 3 calculates only the CPU time for running the program.