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inherited and associated / composite objects
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: t6 Module: Y116
# We have TABLES of various sorts in a room # Associated with each table we have a waitress and multiple customers # We're running a restuarant, seating guests, etc! class person (object): def getname(this): return this.name class customer(person): def __init__(this,name,partysize): this.name = name this.partysize = partysize def getsize(this): return this.partysize class waitress(person): def __init__(this,name,capacity): this.name = name this.capacity = capacity this.ccc = 0 # current customer count / not yet used # --------------------------------------------------- class table(object): def __init__(current,material,w,h,wt): current.sng(material,wt) current.w = w current.h = h current.place = 925 def getbums(current): side = int(current.w/current.place) wide = int(current.h/current.place) return 2 * (side + wide) def setplace(current,p): current.place = p def getdoggie(current): if current.w < current.h: return current.w/2 return current.h/2 def sng(current,material,wt): current.wt = wt current.m = material current.parties = [] def getwaitstaff(self): return self.wt.getname() def seatguests(self,pname): so_far = self.getseated() # already at table adding = pname.getsize() # wanting to join holds = self.getbums() # capacity of table if holds >= so_far + adding: self.parties.append(pname) return True return None def getseated(self): so_far = 0 for pty in self.parties: so_far += pty.getsize() return so_far class recttable(table): pass class squaretable(table): def __init__(current,material,w,wt): current.sng(material,wt) current.w = w current.h = w current.place = 925 class roundtable(table): def __init__(current,material,w,wt): current.sng(material,wt) current.w = w current.h = w current.place = 800 def getbums(current): side = int(current.w * 3.14159265 / current.place) return side # ---------------------------------------------- if __name__ == "__main__": lead = waitress("Heather",12) assist = waitress("Poppy",10) cafe = [recttable("Cherry",2100,980,lead), recttable("Plastic",1800,750,assist), roundtable("Ash",1500,lead), squaretable("oak",5000,assist) ] for tab in cafe: ps1 = tab.getbums() dog = tab.getdoggie() order = tab.getwaitstaff() print "We can seat",ps1,"and doggie distance is",dog,"order from",order if cafe[0].seatguests(customer("Alex",4)): print "We have seated Alex" if cafe[0].seatguests(customer("Simon",3)): print "We have seated Simon" for tab in cafe: ps1 = tab.getbums() ps2 = tab.getseated() order = tab.getwaitstaff() print "We have",ps2,"at a table for",ps1,"looked after by",order # ------------------------------------------------------ """ Sample Output munchkin:opy grahamellis$ python tabby We can seat 6 and doggie distance is 490 order from Heather We can seat 2 and doggie distance is 375 order from Poppy We can seat 5 and doggie distance is 750 order from Heather We can seat 20 and doggie distance is 2500 order from Poppy We have seated Alex We have 4 at a table for 6 looked after by Heather We have 0 at a table for 2 looked after by Poppy We have 0 at a table for 5 looked after by Heather We have 0 at a table for 20 looked after by Poppy munchkin:opy grahamellis$ """ Learn about this subject
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