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‎abstractfactory.py

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class Klass1:
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""" a very simple obj """
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def __init__(self):
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pass
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def hi(self):
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print 'hi'
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class Factory:
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""" base factory that can construct objects in a variety of ways:
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* modules ['package1.subpackage',] to be searched for klass
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* search global namespace
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* create takes a arguement of what type of class to return
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* return a default implementation - subclass must define createDefault()
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"""
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def __init__(self, modules=[]):
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self.modules=modules
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def createDefault(self):
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print dir()
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raise NotImplementedError
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def create(self, klass=None):
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import string
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if klass in globals().keys():
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if type(globals()[klass]).__name__=='class':
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return globals()[klass]()
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for module in self.modules:
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try:
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fromlist = []
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if string.find(module, '.'): fromlist = string.split(module, '.')[:-1]
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module = __import__(module, globals(), locals(), fromlist)
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if hasattr(module, klass): return getattr(module, klass)()
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except AttributeError: pass
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return self.createDefault()
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class MyFactory(Factory):
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""" concrete factory that specifies:
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* what modules to search for
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* implements a createDefault() - which is used if class isnt found
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"""
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def __init__(self, modules=[]):
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Factory.__init__(self,modules)
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def createDefault(self):
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return Klass1()
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#--------much simpler one by mark lutz, http://shell.rmi.net/~lutz/talk.html
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def factory(aClass, *args): # varargs tuple
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return apply(aClass, args) # call aClass
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class Spam:
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def doit(self, message):
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print message
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class Person:
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def __init__(self, name, job):
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self.name = name
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self.job = job
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object1 = factory(Spam)
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object2 = factory(Person, "Guido", "guru")

‎adapter.py

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class Barfooer:
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def barfoo(self, bar, foo):
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pass
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# Per instance, by wrapping and delegation
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class FoobaringWrapper:
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def __init__(self, wrappee):
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self.w = wrappee
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def foobar(self, foo, bar):
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return self.w.barfoo(bar, foo)
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foobarer = FoobaringWrapper(barfooer)
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# Per-classs by subclassing and self-delegation
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class Foobarer(Barfooer):
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def foobar(self,foo, bar):
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return self.barfoo(bar, foo)
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foobarer = Foobarer(some, init, params)
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‎adapter2.py

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class Adaptee:
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def specific_request(self):
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return 'Adaptee'
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class Adapter:
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def __init__(self, adaptee):
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self.adaptee = adaptee
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def request(self):
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return self.adaptee.specific_request()
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client = Adapter(Adaptee())
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print client.request()

‎adaptermartelli.py

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class UppercasingFile:
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def __init__(self, *a, **k):
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self.f = file(*a, **k)
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def write(self, data):
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self.f.write(data.upper())
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def __getattr__(self, name):
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return getattr(self.f, name)

‎bridge.py

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class AbstractParser:
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def __init__(self, scanner):
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self.scanner = scanner
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class ExprParser(AbstractParser):
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def expr(self):
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t = self.scanner.next()...
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self.scanner.push_back(t)...
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‎bridge2.py

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# Implementor
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class DrawingAPI:
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def drawCircle(x, y, radius):
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pass
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# ConcreteImplementor 1/2
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class DrawingAPI1(DrawingAPI):
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def drawCircle(self, x, y, radius):
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print "API1.circle at %f:%f radius %f" % (x, y, radius)
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# ConcreteImplementor 2/2
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class DrawingAPI2(DrawingAPI):
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def drawCircle(self, x, y, radius):
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print "API2.circle at %f:%f radius %f" % (x, y, radius)
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# Abstraction
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class Shape:
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# low-level
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def draw(self):
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pass
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# high-level
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def resizeByPercentage(self, pct):
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pass
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# Refined Abstraction
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class CircleShape(Shape):
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def __init__(self, x, y, radius, drawingAPI):
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self.__x = x
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self.__y = y
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self.__radius = radius
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self.__drawingAPI = drawingAPI
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# low-level i.e. Implementation specific
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def draw(self):
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self.__drawingAPI.drawCircle(self.__x, self.__y, self.__radius)
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# high-level i.e. Abstraction specific
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def resizeByPercentage(self, pct):
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self.__radius *= pct
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def main():
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shapes = [
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CircleShape(1, 2, 3, DrawingAPI1()),
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CircleShape(5, 7, 11, DrawingAPI2())
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]
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for shape in shapes:
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shape.resizeByPercentage(2.5)
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shape.draw()
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if __name__ == "__main__":
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main()
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‎chainofresp2.py

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class Car:
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def __init__(self):
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self.name = None
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self.km = 11100
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self.fuel = 5
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self.oil = 5
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def handle_fuel(car):
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if car.fuel < 10:
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print "added fuel"
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car.fuel = 100
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def handle_km(car):
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if car.km > 10000:
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print "made a car test."
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car.km = 0
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def handle_oil(car):
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if car.oil < 10:
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print "Added oil"
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car.oil = 100
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class Garage:
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def __init__(self):
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self.handlers = []
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def add_handler(self, handler):
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self.handlers.append(handler)
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def handle_car(self, car):
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for handler in self.handlers:
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handler(car)
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if __name__ == '__main__':
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handlers = [handle_fuel, handle_km, handle_oil]
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garage = Garage()
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for handle in handlers:
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garage.add_handler(handle)
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garage.handle_car(Car())
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‎command.py

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# -*- coding: utf8 -*-
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from sys import stdout as console
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# Обработка команды exit
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class SessionClosed(Exception):
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def __init__(self, value):
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self.value = value
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# Интерфейс команды
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class Command:
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def execute(self):
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raise NotImplementedError()
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def cancel(self):
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raise NotImplementedError()
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def name():
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raise NotImplementedError()
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# Команда rm
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class RmCommand(Command):
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def execute(self):
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console.write("You are executed \"rm\" command\n")
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def cancel(self):
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console.write("You are canceled \"rm\" command\n")
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def name(self):
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return "rm"
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# Команда uptime
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class UptimeCommand(Command):
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def execute(self):
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console.write("You are executed \"uptime\" command\n")
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def cancel(self):
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console.write("You are canceled \"uptime\" command\n")
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def name(self):
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return "uptime"
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# Команда undo
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class UndoCommand(Command):
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def execute(self):
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try:
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cmd = HISTORY.pop()
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TRASH.append(cmd)
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console.write("Undo command \"{0}\"\n".format(cmd.name()))
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cmd.cancel()
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except IndexError:
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console.write("ERROR: HISTORY is empty\n")
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def name(self):
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return "undo"
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# Команда redo
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class RedoCommand(Command):
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def execute(self):
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try:
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cmd = TRASH.pop()
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HISTORY.append(cmd)
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console.write("Redo command \"{0}\"\n".format(cmd.name()))
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cmd.execute()
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except IndexError:
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console.write("ERROR: TRASH is empty\n")
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def name(self):
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return "redo"
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# Команда history
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class HistoryCommand(Command):
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def execute(self):
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i = 0
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for cmd in HISTORY:
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console.write("{0}: {1}\n".format(i, cmd.name()))
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i = i + 1
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def name(self):
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print "history"
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# Команда exit
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class ExitCommand(Command):
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def execute(self):
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raise SessionClosed("Good bay!")
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def name(self):
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return "exit"
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# Словарь доступных команд
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COMMANDS = {'rm': RmCommand(), 'uptime': UptimeCommand(), 'undo': UndoCommand(), 'redo': RedoCommand(), 'history': HistoryCommand(), 'exit': ExitCommand()}
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HISTORY = list()
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TRASH = list()
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# Шелл
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def main():
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try:
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while True:
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console.flush()
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console.write("pysh >> ")
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cmd = raw_input()
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try:
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command = COMMANDS[cmd]
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command.execute()
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if not isinstance(command, UndoCommand) and not isinstance(command, RedoCommand) and not isinstance(command, HistoryCommand):
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TRASH = list()
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HISTORY.append(command)
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except KeyError:
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console.write("ERROR: Command \"%s\" not found\n" % cmd)
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except SessionClosed as e:
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console.write(e.value)
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if __name__ == "__main__": main()

‎composite2.py

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class Component(object):
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def __init__(self, *args, **kw):
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pass
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def component_function(self): pass
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class Leaf(Component):
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def __init__(self, *args, **kw):
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Component.__init__(self, *args, **kw)
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def component_function(self):
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print "some function"
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class Composite(Component):
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def __init__(self, *args, **kw):
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Component.__init__(self, *args, **kw)
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self.children = []
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def append_child(self, child):
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self.children.append(child)
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def remove_child(self, child):
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self.children.remove(child)
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def component_function(self):
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map(lambda x: x.component_function(), self.children)
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c = Composite()
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l = Leaf()
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l_two = Leaf()
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c.append_child(l)
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c.append_child(l_two)
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c.component_function()

‎compositechain.py

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>>> class DevelopmentPerformanceMonitor():
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... def getPerformanceMonitorHandlers():
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... return []
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...
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>>> class ProductionPerformanceMonitor():
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... def getPerformanceMonitorHandlers():
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... return [check_cpu_under_load, check_available_hd]
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...
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>>> class DevelopmentExceptionMonitor():
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... def getExceptionHandlers():
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... return [email_local_root, log_exception]
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...
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>>> class ProductionExceptionMonitor():
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... def getExceptionHandlers():
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... return [emails_system_admin, log_exception, create_ticket]
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...
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>>> class SomeSystem:
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... pm = None # Performance Monitor
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... em = None # Exception Monitor
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... def __init__(self, performance_monitor, exception_monitor):
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... pm = performance_monitor
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... em = exception_monitor
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... def on_exception(e):
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... for handler in em.getExceptionHandlers():
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... handler(e)
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... def perform_performance_monitoring(s):
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... for handler in pm.getPerformanceMonitorHandlers():
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... handler(s)

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