python的protobuf 版本对repeated数据类型的处理

   首先定义出地址薄：

syntax = "proto2";

package tutorial;

message Person {
  required string name = 1;
  required int32 id = 2;
  optional string email = 3;

  enum PhoneType {
    MOBILE = 0;
    HOME = 1;
    WORK = 2;
  }

  message PhoneNumber {
    required string number = 1;
    optional PhoneType type = 2 [default = HOME];
  }

  repeated PhoneNumber phones = 4;
}

message AddressBook {
  repeated Person people = 1;
}

   对于protobuf的对象写方法在百度里面很多，我就不加赘述了，重点是比较少的读取的方法，直接上代码：

#! /usr/bin/python

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.HasField('email'):
      print "  E-mail address:", person.email

    for phone_number in person.phones:
      if phone_number.type == addressbook_pb2.Person.PhoneType.MOBILE:
        print "  Mobile phone #: ",
      elif phone_number.type == addressbook_pb2.Person.PhoneType.HOME:
        print "  Home phone #: ",
      elif phone_number.type == addressbook_pb2.Person.PhoneType.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)

   可以看到从文件里面读取string，利用parsefromstring方法还原出message对象，然后对于repeated的属性可以直接利用for循环进行遍历读取，从实际方法上看是很容易的，但是由于protbuf编译出的.py文件里面并没有生成api接口，而是只有DESCRIPTOR，这样就和C++和java版本不同，如果不熟悉python很难从.py文件里面找到对应的方法，所以在这里做做记录