Update //third_party/protobuf to version 3.

third_party/protobuf/examples/list_people.py

+#! /usr/bin/env python
+
+# See README.txt for information and build instructions.
+
+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 #:",
+      elif phone_number.type == addressbook_pb2.Person.HOME:
+        print "  Home phone #:",
+      elif phone_number.type == addressbook_pb2.Person.WORK:
+        print "  Work phone #:",
+      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.
+f = open(sys.argv[1], "rb")
+address_book.ParseFromString(f.read())
+f.close()
+
+ListPeople(address_book)