How to measure time taken between lines of code in python

Question

So in Java  we can do How to measure time taken by a function to execute  But how is it done in python  To measure the time start and end time between lines of codes  Something that does this   import some time library  starttime   some time library some module   code tobe measured    endtime   some time library some module    time taken   endtime - starttime

User · Answer

With a help of a small convenience class, you can measure time spent in indented lines like this:

with CodeTimer():
   line_to_measure()
   another_line()
   # etc...

Which will show the following after the indented line(s) finishes executing:

Code block took: x.xxx ms

UPDATE: You can now get the class with pip install linetimer and then from linetimer import CodeTimer. See this GitHub project.

The code for above class:

import timeit

class CodeTimer:
    def __init__(self, name=None):
        self.name = " '"  + name + "'" if name else ''

    def __enter__(self):
        self.start = timeit.default_timer()

    def __exit__(self, exc_type, exc_value, traceback):
        self.took = (timeit.default_timer() - self.start) * 1000.0
        print('Code block' + self.name + ' took: ' + str(self.took) + ' ms')

You could then name the code blocks you want to measure:

with CodeTimer('loop 1'):
   for i in range(100000):
      pass

with CodeTimer('loop 2'):
   for i in range(100000):
      pass

Code block 'loop 1' took: 4.991 ms
Code block 'loop 2' took: 3.666 ms

And nest them:

with CodeTimer('Outer'):
   for i in range(100000):
      pass

   with CodeTimer('Inner'):
      for i in range(100000):
         pass

   for i in range(100000):
      pass

Code block 'Inner' took: 2.382 ms
Code block 'Outer' took: 10.466 ms

Regarding timeit.default_timer(), it uses the best timer based on OS and Python version, see this answer.

User · Answer

You can try this as well   from time import perf counter  t0   perf counter         t1   perf counter   time taken   t1 - t0

User · Answer

I always prefer to check time in hours  minutes and seconds   H  M  S  format   from datetime import datetime start   datetime now     your code end   datetime now   time taken   end - start print  Time    time taken     output    Time   0 00 00 000019

User · Answer

Putting the code in a function  then using a decorator for timing is another option   Source  The advantage of this method is that you define timer once and use it with a simple additional line for every function  First  define timer decorator  import functools import time  def timer func        functools wraps func      def wrapper  args    kwargs           start time   time perf counter           value   func  args    kwargs          end time   time perf counter           run time   end time - start time         print  quot Finished    in    secs quot  format repr func   name     round run time  3            return value      return wrapper  Then  use the decorator while defining the function   timer def doubled and add num       res   sum  i 2 for i in range num        print  quot Result      quot  format res    Let s try  doubled and add 100000  doubled and add 1000000   Output  Result   9999900000 Finished  doubled and add  in 0 0119 secs Result   999999000000 Finished  doubled and add  in 0 0897 secs  Note  I m not sure why to use time perf counter instead of time time  Comments are welcome

User · Answer

You can also use time library   import time  start   time time      your code    end  print f Time   time time   - start

User · Answer

If you want to measure CPU time  can use time process time   for Python 3 3 and above   import time start   time process time     your code here     print time process time   - start    First call turns the timer on  and second call tells you how many seconds have elapsed   There is also a function time clock    but it is deprecated since Python 3 3 and will be removed in Python 3 8   There are better profiling tools like timeit and profile  however time process time   will measure the CPU time and this is what you re are asking about   If you want to measure wall clock time instead  use time time

User · Answer

I was looking for a way how to output a formatted time with minimal code  so here is my solution  Many people use Pandas anyway  so in some cases this can save from additional library imports   import pandas as pd start   pd Timestamp now     code print pd Timestamp now  -start    Output   0 days 00 05 32 541600   I would recommend using this if time precision is not the most important  otherwise use time library    timeit pd Timestamp now   outputs 3 29   s    214 ns per loop   timeit time time   outputs 154 ns    13 3 ns per loop

[python] How to measure time taken between lines of code in python?

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