text: #! /usr/bin/env python
  
  # See README.txt for information and build instructions.
  
  from __future__ import print_function
  import addressbook_pb2
  import sys
  
  
  # Iterates though all people in the AddressBook and prints info about them.
  def ListPeople(address_book):
    for person in address_book.people:
      print("Person ID:", person.id)
      print("  Name:", person.name)
      if person.email != "":
        print("  E-mail address:", person.email)
  
      for phone_number in person.phones:
        if phone_number.type == addressbook_pb2.Person.MOBILE:
          print("  Mobile phone #:", end=" ")
        elif phone_number.type == addressbook_pb2.Person.HOME:
          print("  Home phone #:", end=" ")
        elif phone_number.type == addressbook_pb2.Person.WORK:
          print("  Work phone #:", end=" ")
        print(phone_number.number)
  
  
  # Main procedure:  Reads the entire address book from a file and prints all
  #   the information inside.
  if len(sys.argv) != 2:
    print("Usage:", sys.argv[0], "ADDRESS_BOOK_FILE")
    sys.exit(-1)
  
  address_book = addressbook_pb2.AddressBook()
  
  # Read the existing address book.
  with open(sys.argv[1], "rb") as f:
    address_book.ParseFromString(f.read())
  
  ListPeople(address_book)
  