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#!/usr/bin/env python

# -*- coding: utf-8 -*-

import time

class SalesManager:

def work(self):

print("Sales Manager working...")

def talk(self):

print("Sales Manager ready to talk")

class Proxy:

def __init__(self):

self.busy = 'No'

self.sales = None

def work(self):

print("Proxy checking for Sales Manager availability")

if self.busy == 'No':

self.sales = SalesManager()

time.sleep(2)

self.sales.talk()

else:

time.sleep(2)

print("Sales Manager is busy")

class NoTalkProxy(Proxy):

def __init__(self):

Proxy.__init__(self)

def work(self):

print("Proxy checking for Sales Manager availability")

time.sleep(2)

print("This Sales Manager will not talk to you whether he/she is busy or not")

if __name__ == '__main__':

p = Proxy()

p.work()

p.busy = 'Yes'

p.work()

p = NoTalkProxy()

p.work()

p.busy = 'Yes'

p.work()

### OUTPUT ###

# Proxy checking for Sales Manager availability

# Sales Manager ready to talk

# Proxy checking for Sales Manager availability

# Sales Manager is busy

# Proxy checking for Sales Manager availability

# This Sales Manager will not talk to you whether he/she is busy or not

# Proxy checking for Sales Manager availability

# This Sales Manager will not talk to you whether he/she is busy or not