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Profiling your Python program

Python's profiler lets you run code and log statistics, and the pstats module allows you to anaylse the resulting statistics. New example from last week's Intermediate Python Course is [here].

  import cProfile
  import pstats
  
  import railway
  
  cProfile.run("railway.test_code()","profile.out")
  
  result = pstats.Stats("profile.out")
  result.sort_stats("ncalls")
  
  result.print_stats()
  result.print_callees()


As ever with Python, the code example is largely self-describing ... take a look at the source (linked above) to show you some sample output too. The call being profiled is [here] amd the data may be viewed [here]. Data can be downloaded from [here] (that way tabs and spaces come through correct if you want to run the program!)

(written 2016-11-01)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
Y212 - Python - Code testing, patterns, profiles and optimisation.
  [4618] Pytest - second example beyond hello world - (2016-01-08)
  [4617] Pytest - starting example - (2016-01-07)
  [4542] The principle of mocking - and the Python Mock package - (2015-10-17)
  [4540] Unittest of a Flask application including forms - (2015-10-15)
  [4538] Flask and unittest - hello web app test world - (2015-10-15)
  [4470] Testing in Python 3 - unittest, doctest and __name__ == __main__ too. - (2015-04-21)
  [4446] Combining tests into suites, and suites into bigger suites - Python and unittest - (2015-03-01)
  [4344] Python base and inherited classes, test harness and unit testing - new examples - (2014-12-07)
  [4326] Learning to program - comments, documentation and test code - (2014-11-22)
  [4090] Test Driven Development in Python - Customer Comes First - (2013-05-16)
  [3658] Using Make for a distribution - (2012-03-17)
  [3478] Testing your Python classes with the unittest package - how to - (2011-10-14)
  [3464] Passing optional and named parameters to python methods - (2011-10-04)
  [3442] A demonstration of how many Python facilities work together - (2011-09-16)
  [3441] Pressing ^C in a Python program. Also Progress Bar. - (2011-09-15)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [2123] Using Python with OpenOffice - (2009-04-09)
  [1555] Advanced Python, Perl, PHP and Tcl training courses / classes - (2008-02-25)
  [1148] Python decorators - wrapping a method call in extra code - (2007-04-15)
  [1146] __new__ v __init__ - python constructor alternatives? - (2007-04-14)
  [1140] Python GTK - Widget, Packing, Event and Feedback example - (2007-04-09)
  [235] Preparation for a day's work - (2005-03-04)


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with in Python - examples of use, and of defining your own context
Some other Articles
Celebrating our diversity rather than discriminating for it
Nesting decorators
Defining an object that is a modified standard type in Python
with in Python - examples of use, and of defining your own context
Profiling your Python program
Well House Manor - Still five out of five!
The technical article feed continues - personal updates more proactive on Facebook now!
Equality (in Python)
A reminder of the key issues to consider in moving from Python 2 to Python 3
Convering from Python 2 to Python 3 - an update, and the 2to3 utility
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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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