A description of how Python logs the program's Run time

This article mainly introduces the Python recording program run time of several methods of relevant information, the need for friends can refer to the following

First seen in handwritten, similar to the following:

Import datetime  def time_1 ():    begin = Datetime.datetime.now ()     sum = 0 for   i in Xrange (10000000):     sum = sum + I   end = Datetime.datetime.now ()    return end-begin print time_1 ()

The output is as follows:

➜  python python time_1.py0:00:00.280797

Three ways Python logs program run time

Here are three ways to run the Python logger, with the implementation code, and finally the comparison, as you can see below:

Method 1

Import datetimestarttime = Datetime.datetime.now () #long runningendtime = Datetime.datetime.now () print (Endtime- starttime). Seconds

Method 2

Start = Time.time () run_fun () end = Time.time () print End-start

Method 3

Start = Time.clock () run_fun () end = Time.clock () print End-start

Both Method 1 and Method 2 contain the time that other programs use the CPU, which is the time the program starts to run to the end of the program.

Method 3 calculates only the CPU time that the program is running