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Constants in Python
Applying OO design techniques and best practise example from a Well House Consultants training course
More on Applying OO design techniques and best practise [link]
Source code: constant.py Module: Y116
"""In reallity, you don't use constants in Python - you use variables named to strongly discourage you from changing them. Here is a sample file that sets up some 'constants'. Follow the link at the top of this page (to http://www.wellho.net/mouth/2485_.html) to see how the file is used and to read more about Python Constants or the lack thereof!)""" import time class whc: """A file of values to be used as globals or constants throughout our company's Python programs. By using this file, you are able to change the VAT rate (which is 15% as I write this in late 2009, but goes up to 15.0% on the 1st January 2010 in ONE PLACE only""" VAT = 15 PHONE = "01225 708225" FREEPHONE = "0800 043 8225" COMPANY = "Well House Consultants Ltd" COPYRIGHT = "Copyright " + COMPANY + time.strftime(", %Y") if __name__ == "__main__": for item in dir(whc): print item,":", exec ("print whc."+item) 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
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