python-patterns/catalog.py at master · co89757/python-patterns · GitHub

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#!/usr/bin/env python

# -*- coding: utf-8 -*-

"""

A class that uses different static function depending of a parameter passed in

init. Note the use of a single dictionary instead of multiple conditions

"""

__author__ = "Ibrahim Diop <http://ibrahim.zinaria.com>"

__gist__ = "<https://gist.github.com/diopib/7679559>"

class Catalog():

"""

catalog of multiple static methods that are executed depending on an init

parameter

"""

def __init__(self, param):

# dictionary that will be used to determine which static method is

# to be executed but that will be also used to store possible param

# value

self._static_method_choices = {'param_value_1': self._static_method_1,

'param_value_2': self._static_method_2}

# simple test to validate param value

if param in self._static_method_choices.keys():

self.param = param

else:

raise ValueError("Invalid Value for Param: {0}".format(param))

@staticmethod

def _static_method_1():

print("executed method 1!")

@staticmethod

def _static_method_2():

print("executed method 2!")

def main_method(self):

"""

will execute either _static_method_1 or _static_method_2

depending on self.param value

"""

self._static_method_choices[self.param]()

def main():

"""

>>> c = Catalog('param_value_1').main_method()

executed method 1!

>>> Catalog('param_value_2').main_method()

executed method 2!

"""

test = Catalog('param_value_2')

test.main_method()

if __name__ == "__main__":

main()

### OUTPUT ###

# executed method 2!

python-patterns/catalog.py at master · co89757/python-patterns · GitHub

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