What is the Python equivalent of Matlab s tic and toc functions

Question

User · Answer

The absolute best analog of tic and toc would be to simply define them in python.

def tic():
    #Homemade version of matlab tic and toc functions
    import time
    global startTime_for_tictoc
    startTime_for_tictoc = time.time()

def toc():
    import time
    if 'startTime_for_tictoc' in globals():
        print "Elapsed time is " + str(time.time() - startTime_for_tictoc) + " seconds."
    else:
        print "Toc: start time not set"

Then you can use them as:

tic()
# do stuff
toc()

User · Answer

This can also be done using a wrapper  Very general way of keeping time   The wrapper in this example code wraps any function and prints the amount of time needed to execute the function   def timethis f       import time      def wrapped  args    kwargs           start   time time           r   f  args    kwargs          print  Executing  0  took  1  seconds  format f func name   time time  -start          return r     return wrapped   timethis def thistakestime        for x in range 10000000           pass  thistakestime

User · Answer

Apart from timeit which ThiefMaster mentioned  a simple way to do it is just  after importing time    t   time time     do stuff elapsed   time time   - t   I have a helper class I like to use   class Timer object       def   init   self  name None           self name   name      def   enter   self           self tstart   time time        def   exit   self  type  value  traceback           if self name              print    s     self name           print  Elapsed   s     time time   - self tstart     It can be used as a context manager   with Timer  foo stuff         do some foo      do some stuff   Sometimes I find this technique more convenient than timeit - it all depends on what you want to measure

User · Answer

I have just created a module  tictoc py  for achieving nested tic tocs  which is what Matlab does   from time import time  tics       def tic        tics append time     def toc        if len tics   0          return None     else          return time  -tics pop     And it works this way   from tictoc import tic  toc    This keeps track of the whole process tic      Timing a small portion of code  maybe a loop  tic      -- Nested code here --    End toc      This returns the elapse time  in seconds  since the last invocation of tic   toc      This does the same for the first tic     I hope it helps

User · Answer

Have a look at the timeit module  It s not really equivalent but if the code you want to time is inside a function you can easily use it

User · Answer

Building on Stefan and antonimmo s answers  I ended up putting  def Tictoc        start stack          start named           def tic name None           if name is None              start stack append time            else              start named name    time        def toc name None           if name is None              start   start stack pop           else              start   start named pop name          elapsed   time   - start         return elapsed     return tic  toc   in a utils py module  and I use it with a  from utils import Tictoc tic  toc   Tictoc     This way   you can simply use tic    toc   and nest them like in Matlab alternatively  you can name them  tic 1   toc 1  or tic  very-important-block    toc  very-important-block   and timers with different names won t interfere importing them this way prevents interference between modules using it     here toc does not print the elapsed time  but returns it

User · Answer

Updating Eli s answer to Python 3   class Timer object       def   init   self  name None  filename None           self name   name         self filename   filename      def   enter   self           self tstart   time time        def   exit   self  type  value  traceback           message    Elapsed    2f seconds     time time   - self tstart          if self name              message      s      self name   message         print message          if self filename              with open self filename  a   as file                  print str datetime datetime now         message file file    Just like Eli s  it can be used as a context manager   import time  with Timer  Count        for i in range 0 10 000 000           pass   Output     Count  Elapsed  0 27 seconds   I have also updated it to print the units of time reported  seconds  and trim the number of digits as suggested by Can  and with the option of also appending to a log file  You must import datetime to use the logging feature   import time import datetime  with Timer  Count    log txt            for i in range 0 10 000 000           pass

User · Answer

I had the same question when I migrated to python from Matlab   With the help of this thread I was able to construct an exact analog of the Matlab tic   and toc   functions   Simply insert the following code at the top of your script   import time  def TicTocGenerator          Generator that returns time differences     ti   0             initial time     tf   time time     final time     while True          ti   tf         tf   time time           yield tf-ti   returns the time difference  TicToc   TicTocGenerator     create an instance of the TicTocGen generator    This will be the main function through which we define both tic   and toc   def toc tempBool True         Prints the time difference yielded by generator instance TicToc     tempTimeInterval   next TicToc      if tempBool          print   Elapsed time   f seconds  n   tempTimeInterval    def tic          Records a time in TicToc  marks the beginning of a time interval     toc False    That s it  Now we are ready to fully use tic   and toc   just as in Matlab   For example  tic    time sleep 5   toc     returns  Elapsed time  5 00 seconds     Actually  this is more versatile than the built-in Matlab functions   Here  you could create another instance of the TicTocGenerator to keep track of multiple operations  or just to time things differently  For instance  while timing a script  we can now time each piece of the script seperately  as well as the entire script   I will provide a concrete example   TicToc2   TicTocGenerator     create another instance of the TicTocGen generator  def toc2 tempBool True         Prints the time difference yielded by generator instance TicToc2     tempTimeInterval   next TicToc2      if tempBool      print   Elapsed time 2   f seconds  n   tempTimeInterval    def tic2          Records a time in TicToc2  marks the beginning of a time interval     toc2 False    Now you should be able to time two separate things  In the following example  we time the total script and parts of a script separately   tic    time sleep 5   tic2    time sleep 3   toc2     returns  Elapsed time 2  5 00 seconds    toc     returns  Elapsed time  8 00 seconds     Actually  you do not even need to use tic   each time  If you have a series of commands that you want to time  then you can write  tic    time sleep 1   toc     returns  Elapsed time  1 00 seconds    time sleep 2   toc     returns  Elapsed time  2 00 seconds    time sleep 3   toc     returns  Elapsed time  3 00 seconds      and so on      I hope that this is helpful

User · Answer

You can use tic and toc from ttictoc  Install it with  pip install ttictoc   And just import them in your script as follow  from ttictoc import tic toc tic     Some code print toc

User · Answer

pip install easy-tictoc   In the code   from tictoc import tic  toc  tic     Some code  toc       Disclaimer  I m the author of this library

User · Answer

I changed  Eli Bendersky s answer a little bit to use the ctor   init     and dtor   del     to do the timing  so that it can be used more conveniently without indenting the original code   class Timer object       def   init   self  name None           self name   name         self tstart   time time        def   del   self           if self name              print   s elapsed    2fs     self name  time time   - self tstart          else              print  Elapsed    2fs     time time   - self tstart    To use  simple put Timer  blahblah   at the beginning of some local scope  Elapsed time will be printed at the end of the scope   for i in xrange 5       timer   Timer  eigh         x   numpy random random  4000 4000        x    x x T  2     numpy linalg eigh x      print i 1 timer   None   It prints out   1 eigh   elapsed  10 13s 2 eigh   elapsed  9 74s 3 eigh   elapsed  10 70s 4 eigh   elapsed  10 25s 5 eigh   elapsed  11 28s

User · Answer

Usually  IPython s  time   timeit   prun and  lprun  if one has line profiler installed  satisfy my profiling needs quite well  However  a use case for tic-toc-like functionality arose when I tried to profile calculations that were interactively driven  i e   by the user s mouse motion in a GUI  I felt like spamming tics and tocs in the sources while testing interactively would be the fastest way to reveal the bottlenecks  I went with Eli Bendersky s Timer class  but wasn t fully happy  since it required me to change the indentation of my code  which can be inconvenient in some editors and confuses the version control system  Moreover  there may be the need to measure the time between points in different functions  which wouldn t work with the with statement  After trying lots of Python cleverness  here is the simple solution that I found worked best   from time import time  tstart stack       def tic         tstart stack append time     def toc fmt  Elapsed   s s        print fmt    time   -  tstart stack pop      Since this works by pushing the starting times on a stack  it will work correctly for multiple levels of tics and tocs  It also allows one to change the format string of the toc statement to display additional information  which I liked about Eli s Timer class   For some reason I got concerned with the overhead of a pure Python implementation  so I tested  a C extension module as well    include  lt Python h gt   include  lt mach mach time h gt   define MAXDEPTH 100  uint64 t start MAXDEPTH   int lvl 0   static PyObject  tic PyObject  self  PyObject  args        start lvl      mach absolute time        Py RETURN NONE     static PyObject  toc PyObject  self  PyObject  args    return PyFloat FromDouble           double  mach absolute time   - start --lvl     1000000000L      static PyObject  res PyObject  self  PyObject  args        return tic NULL  NULL   toc NULL  NULL      static PyMethodDef methods             tic   tic  METH NOARGS   Start timer          toc   toc  METH NOARGS   Stop timer          res   res  METH NOARGS   Test timer resolution         NULL  NULL  0  NULL      PyMODINIT FUNC inittictoc void        Py InitModule  tictoc   methods       This is for MacOSX  and I have omitted code to check if lvl is out of bounds for brevity  While tictoc res   yields a resolution of about 50 nanoseconds on my system  I found that the jitter of measuring any Python statement is easily in the microsecond range  and much more when used from IPython   At this point  the overhead of the Python implementation becomes negligible  so that it can be used with the same confidence as the C implementation    I found that the usefulness of the tic-toc-approach is practically limited to code blocks that take more than 10 microseconds to execute  Below that  averaging strategies like in timeit are required to get a faithful measurement

[python] What is the Python equivalent of Matlab's tic and toc functions?

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