"Programming Ideas" "Design patterns" "structural patterns structural" MVC

Python version

https://github.com/faif/python-patterns/blob/master/structural/mvc.py

#!/usr/bin/env python#-*-coding:utf-8-*-"""*tl;dr80separates data in GUIs from the ways it is presented, and accepted."""classModel (object):def __iter__(self):RaiseNotimplementederrordefGet (Self, item):"""Returns a object with a. Items (), call method, iterates over key,value pairs of its information."""        RaiseNotimplementederror @propertydefItem_type (self):RaiseNotimplementederrorclassProductModel (Model):classPrice (float):"""a polymorphic-pass a float with a particular __str__ functionality."""        def __str__(self): First_digits_str= STR (round (Self, 2))            Try: Dot_location= First_digits_str.index ('.')            exceptValueError:return(First_digits_str +'. XX')            Else:                return(First_digits_str +'0'* (3 + dot_location-Len (FIRST_DIGITS_STR))) Products= {        'Milk': {' Price': Price (1.50),'Quantity': 10},        'eggs': {' Price': Price (0.20),'Quantity': 100},        'Cheese': {' Price': Price (2.00),'Quantity': 10}} Item_type='Product'    def __iter__(self): forIteminchself.products:yieldItemdefGet (self, product):Try:            returnSelf.products[product]exceptKeyerror as E:RaiseKeyerror ((str (e) +"Not in the model ' s item list."))classView (object):defshow_item_list (self, Item_type, item_list):RaiseNotimplementederrordefshow_item_information (self, item_type, Item_name, item_info):"""Would look for item information by iterating through key,value pairs yielded by item_info.items ()"""        RaiseNotimplementederrordefItem_not_found (self, Item_type, item_name):RaiseNotimplementederrorclassConsoleview (View):defshow_item_list (self, Item_type, item_list):Print(Item_type.upper () +'LIST:')         forIteminchitem_list:Print(item)Print("') @staticmethoddefCapitalizer (String):returnString[0].upper () + string[1:].lower ()defshow_item_information (self, item_type, Item_name, item_info):Print(Item_type.upper () +'Information:') PrintOut='Name:%s'%Item_name forKey, ValueinchItem_info.items (): PrintOut+= (', '+ Self.capitalizer (str (key)) +': '+str (value)) PrintOut+='\ n'        Print(printout)defItem_not_found (self, Item_type, item_name):Print('That %s '%s ' does not exist in the records'%(Item_type, item_name))classController (object):def __init__(self, Model, view): Self.model=Model Self.view=ViewdefShow_items (self): items=list (Self.model) Item_type=Self.model.item_type self.view.show_item_list (item_type, items)defshow_item_information (Self, item_name):Try: Item_info=self.model.get (item_name)except: Item_type=Self.model.item_type self.view.item_not_found (Item_type, Item_name)Else: Item_type=Self.model.item_type self.view.show_item_information (Item_type, Item_name, Item_info)if __name__=='__main__': Model=ProductModel () View=Consoleview () controller=Controller (model, view) Controller.show_items () controller.show_item_information ('Cheese') controller.show_item_information ('eggs') controller.show_item_information ('Milk') controller.show_item_information ('Arepas')## # OUTPUT # # ##PRODUCT LIST:#Cheese#eggs#Milk##PRODUCT Information:#Name:cheese, price:2.00, Quantity:10##PRODUCT Information:#Name:eggs, price:0.20, quantity:100##PRODUCT Information:#Name:milk, price:1.50, Quantity:10##That product "Arepas" does not exist in the records

Python reproduced version

"Programming Ideas" "Design patterns" "structural patterns structural" MVC