Python time measure function

Question

I want to create a python function to test the time spent in each function and print its name with its time  how i can print the function name and if there is another way to do so please tell me  def measureTime a       start   time clock        a       elapsed   time clock       elapsed   elapsed - start     print  Time spent in  function name  is     elapsed

User · Answer

There is an easy tool for timing  https   github com RalphMao PyTimer  It can work like a decorator   from pytimer import Timer  Timer average False        def matmul a b  times 100       for i in range times           np dot a b            Output   matmul 0 368434 matmul 2 839355   It can also work like a plug-in timer with namespace control helpful if you are inserting it to a function which has a lot of codes and may be called anywhere else    timer   Timer                                              def any function                                               timer start                                                 for i in range 10                                               timer reset                                                np dot np ones  100 1000    np zeros  1000 500            timer checkpoint  block1                                    np dot np ones  100 1000    np zeros  1000 500            np dot np ones  100 1000    np zeros  1000 500            timer checkpoint  block2                                   np dot np ones  100 1000    np zeros  1000 1000         for j in range 20                                              np dot np ones  100 1000    np zeros  1000 500        timer summary                                           for i in range 2                                               any function                                             Output           Timing Summary of Default Timer         block2 0 065062 block1 0 032529         Timing Summary of Default Timer         block2 0 065838 block1 0 032891   Hope it will help

User · Answer

My way of doing it   from time import time  def printTime start       end   time       duration   end - start     if duration  lt  60          return  used      str round duration  2      s       else          mins   int duration   60          secs   round duration   60  2          if mins  lt  60              return  used      str mins     m     str secs     s           else              hours   int duration   3600              mins   mins   60             return  used      str hours     h     str mins     m     str secs     s     Set a variable as start   time   before execute the function loops  and printTime start  right after the block   and you got the answer

User · Answer

First and foremost  I highly suggest using a profiler or atleast use timeit  However if you wanted to write your own timing method strictly to learn  here is somewhere to get started using a decorator  Python 2  def timing f       def wrap  args           time1   time time           ret   f  args          time2   time time           print   s function took  0 3f ms     f func name   time2-time1  1000 0          return ret     return wrap  And the usage is very simple  just use the  timing decorator   timing def do work       code  Python 3  def timing f       def wrap  args    kwargs           time1   time time           ret   f  args    kwargs          time2   time time           print    s  function took    3f  ms  format f   name     time2-time1  1000 0            return ret     return wrap  Note I m calling f func name to get the function name as a string in Python 2   or f   name    in Python 3

User · Answer

Decorator method using decorator Python library   import decorator   decorator def timing func   args    kwargs          Function timing wrapper         Example of using             timing                  fn     s  s     func   module    func   name         timer   Timer       with timer          ret   func  args    kwargs       log info u  s -  0 3f sec     fn  timer duration in seconds         return ret   See post on my Blog   post on mobilepro pl Blog  my post on Google Plus

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Elaborating on  Jonathan Ray I think this does the trick a bit better import time import inspect  def timed f callable       start   time time       ret   f       elapsed   1000  time time   - start      source code inspect getsource f  strip   n        logger info source code  quot     quot  str elapsed   quot  seconds quot       return ret  It allows to take a regular line of code  say a   np sin np pi  and transform it rather simply into a   timed lambda  np sin np pi    so that the timing is printed onto the logger and you can keep the same assignment of the result to a variable you might need for further work  I suppose in Python 3 8 one could use the    but I do not have 3 8 yet

User · Answer

Timeit has two big flaws  it doesn t return the return value of the function  and it uses eval  which requires passing in extra setup code for imports   This solves both problems simply and elegantly   def timed f     start   time time     ret   f     elapsed   time time   - start   return ret  elapsed  timed lambda  database foo execute  select count    from source apachelog      lt sqlalchemy engine result ResultProxy object at 0x7fd6c20fc690 gt   4 07547402381897

User · Answer

After playing with the timeit module  I don t like its interface  which is not so elegant compared to the following two method   The following code is in Python 3   The decorator method  This is almost the same with  Mike s method  Here I add kwargs and functools wrap to make it better   def timeit func        functools wraps func      def newfunc  args    kwargs           startTime   time time           func  args    kwargs          elapsedTime   time time   - startTime         print  function      finished in    ms  format              func   name    int elapsedTime   1000        return newfunc   timeit def foobar        mike   Person       mike think 30    The context manager method  from contextlib import contextmanager   contextmanager def timeit context name       startTime   time time       yield     elapsedTime   time time   - startTime     print       finished in    ms  format name  int elapsedTime   1000      For example  you can use it like   with timeit context  My profiling code        mike   Person       mike think     And the code within the with block will be timed   Conclusion  Using the first method  you can eaily comment out the decorator to get the normal code  However  it can only time a function  If you have some part of code that you don t what to make it a function  then you can choose the second method   For example  now you have  images   get images   bigImage   ImagePacker pack images  width 4096  drawer draw bigImage    Now you want to time the bigImage       line  If you change it to a function  it will be   images   get images   bitImage   None  timeit def foobar        nonlocal bigImage     bigImage   ImagePacker pack images  width 4096  drawer draw bigImage    Looks not so great   What if you are in Python 2  which has no nonlocal keyword   Instead  using the second method fits here very well   images   get images   with timeit context  foobar        bigImage   ImagePacker pack images  width 4096  drawer draw bigImage

User · Answer

I don t see what the problem with the timeit module is  This is probably the simplest way to do it    import timeit timeit timeit a  number 1    Its also possible to send arguments to the functions  All you need is to wrap your function up using decorators  More explanation here  http   www pythoncentral io time-a-python-function   The only case where you might be interested in writing your own timing statements is if you want to run a function only once and are also want to obtain its return value   The advantage of using the  timeit module is that it lets you repeat the number of executions  This might be necessary because other processes might interfere with your timing accuracy  So  you should run it multiple times and look at the lowest value

[python] Python time measure function

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