Python: What are each line in this code doing?

Python, Perl and Golang Python
1

I have been tearing this code apart and putting it back together.
I understand some of the concept but not all of them.

Can you please tell me what each line in this code does?

class Site(object):
def __init__(self, SiteNum="0", SiteAddr="", SiteInv=0):
self.ID=SiteNum
self.Addr=SiteAddr
self.__Inv=int(SiteInv)
def getInv(self):
return self.__Inv
def setInv(self, items):
self.__Inv=int(items)
Inventory=property(getInv, setInv)
class Store(Site):

def Sale(self, items):
itemCnt=int(items)
self.Inventory -= itemCnt
class Whse(Site):

def Recv(self, items):
itemCnt=int(items)
self.Inventory += itemCnt
store1=Store(SiteNum="001", SiteAddr="456 Elm St", SiteInv=1000)
wh1=Whse(SiteNum="002", SiteAddr="789 Maple St", SiteInv=20000)

Thanks everyone!

Novice

2

You have to fix the Tabs, it wont work like this

3

Im not more than a beginner in python but here’s some of it (as i think it should be tabbed) if something is wrong someone else can hopefully point that out.

class Site(object):
    #Defines the __init__ method, makes you Site object be 
able to take in a few arguments
    #Default values are set if non are supplied
    def __init__(self, SiteNum="0", SiteAddr="", SiteInv=0):
        #Sets the ID and Addr to submitted values
        self.ID=SiteNum
        self.Addr=SiteAddr
        #Sets the private variable __Inv to the supplied value of SiteInv converting it to int
        self.__Inv=int(SiteInv)

        #Method that returns private var __Inv
    def getInv(self):
        return self.__Inv

        #Method used to set the private var __Inv, takes the argument items
    def setInv(self, items):
        #Sets the variable
        self.__Inv=int(items)

    #Sets the property attribute, insteed of using x.getInv(), you can use x.getInv
    #http://docs.python.org/library/functions.html#property
    Inventory=property(getInv, setInv)

#Class ´´Store´´ which extends ´´Site´´
class Store(Site):

    def Sale(self, items):
        itemCnt=int(items)
        self.Inventory -= itemCnt

#Class ´´Whse´´ which extends ´´Site´´
class Whse(Site):
    def Recv(self, items):
        itemCnt=int(items)
        self.Inventory += itemCnt

#Creates a new Store object taking i initial values
store1=Store(SiteNum="001", SiteAddr="456 Elm St", SiteInv=1000)
wh1=Whse(SiteNum="002", SiteAddr="789 Maple St", SiteInv=20000)