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static (class) methods via decorators
Objects - Intermediate example from a Well House Consultants training course
More on Objects - Intermediate [link]

This example is described in the following article(s):
   • Methods that run on classes (static methods) in Python - [link]

This example references the following resources:
http://www.wellho.net/mouth/2693_.html

Source code: ting2 Module: Y112

""" This example shows how you can write dynamic (or object)
methods in Python - example is "getval", or static methods
using the @staticmethod decorator. You can also write methods
which work in both ways, using the @classmethod decorator.

One of the common requirements in any Object based system is
to write comparators, and this example includes both "larger"
and "largest" methods to illustrat how it's well done in Python.

If you've found this page on our web site, the link above will
take you to further text about staticmethod and classmethod; if
you need to see the URL, it's
        http://www.wellho.net/mouth/2693_.html

"""


class thing(object):
   count = 0

   def __init__(self, value):
      self.value = value
      if value > 6:
         thing.count += 1

   def getval(self):
      return self.value

   # Make it callable on class
   @staticmethod
   def counter():
      return thing.count

   # Make it callable on objects or class
   @classmethod
   def counter2(self):
      # "self" is the object or the class
      return thing.count

   def larger(this,that):
      if this.getval() > that.getval():
          return this
      return that

   @staticmethod
   def largest(these):
      so_far = these[0]
      for tryme in these[1:]:
          so_far = tryme.larger(so_far)
      return so_far

stuff = [thing(4), thing(6), thing(12), thing(9)]

print thing.counter()
print thing.counter2()

lgr = stuff[3].larger(stuff[1])
print lgr.getval()

lgs = thing.largest(stuff)
print lgs.getval()

""" Sample output:

Dorothy-2:pyx grahamellis$ python ting2
2
2
9
12
Dorothy-2:pyx grahamellis$

"""

Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in Python
 * Python Programming
 * Intermediate Python
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering Python are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Objects - Intermediate" training module. You'll find a description of the topic and some other closely related examples on the "Objects - Intermediate" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
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The Horse's mouth provides a daily tip or thought.
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• All of these resources can be searched through through our search engine
• And there's a global index here.

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