visitor_exercise.py

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from .visitor_village import Visitor_Village
from .visitor_ordervisitor import OrderVisitor
 
 
 
# ! [Using Visitor in Python]
def Visitor_Exercise():
    print()
    print("Visitor Exercise")
 
    print("  Creating Village")
    village = Visitor_Village()
    village.LoadVillage()
 
    visitor = OrderVisitor([ "hamburger" ])
    print("  Ordering a hamburger from a shop in the {0}".format(village.Name))
 
    # Visit all shops and place an order for a hamburger at the shop
    # that sells them.  We don't know which shop it is and we don't
    # need to know until we receive the order.
    village.Accept(visitor)
    if visitor.ItemsReceived:
        # We are expecting only a single item
        print("  We received a {0} from {1}.".format(visitor.ItemsReceived[0], visitor.ShopNameReceivedFrom))
    else:
        print("  Failed to receive a {0}".format(visitor.ItemsToOrder[0]))
 
    print("  Done.")
# ! [Using Visitor in Python]