Estou seguindo este guia (https://developers.google.com/protocol-buffers/docs/pythontutorial) e usando a amostra exata de addressbook.proto.

Poste também o conteúdo do arquivo addressbook_pb2.py gerado pelo compilador. Quando executo o programa simples a seguir, há um erro dizendo: não consigo encontrar o google.protobuf, alguma idéia de como resolver esse problema? Obrigado.

BTW, usando Python 2.7 no Mac OSX.

from addressbook_pb2 import Person

p = Person()
p.email = "abc"

print p.email

Aqui está o arquivo gerado automaticamente addressbook_pb2.py,

# Generated by the protocol buffer compiler.  DO NOT EDIT!
# source: addressbook.proto

import sys
_b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
from google.protobuf import descriptor as _descriptor
from google.protobuf import message as _message
from google.protobuf import reflection as _reflection
from google.protobuf import symbol_database as _symbol_database
from google.protobuf import descriptor_pb2
# @@protoc_insertion_point(imports)

_sym_db = _symbol_database.Default()




DESCRIPTOR = _descriptor.FileDescriptor(
  name='addressbook.proto',
  package='tutorial',
  syntax='proto2',
  serialized_pb=_b('\n\x11\x61\x64\x64ressbook.proto\x12\x08tutorial\"\xda\x01\n\x06Person\x12\x0c\n\x04name\x18\x01 \x02(\t\x12\n\n\x02id\x18\x02 \x02(\x05\x12\r\n\x05\x65mail\x18\x03 \x01(\t\x12+\n\x05phone\x18\x04 \x03(\x0b\x32\x1c.tutorial.Person.PhoneNumber\x1aM\n\x0bPhoneNumber\x12\x0e\n\x06number\x18\x01 \x02(\t\x12.\n\x04type\x18\x02 \x01(\x0e\x32\x1a.tutorial.Person.PhoneType:\x04HOME\"+\n\tPhoneType\x12\n\n\x06MOBILE\x10\x00\x12\x08\n\x04HOME\x10\x01\x12\x08\n\x04WORK\x10\x02\"/\n\x0b\x41\x64\x64ressBook\x12 \n\x06person\x18\x01 \x03(\x0b\x32\x10.tutorial.Person')
)
_sym_db.RegisterFileDescriptor(DESCRIPTOR)



_PERSON_PHONETYPE = _descriptor.EnumDescriptor(
  name='PhoneType',
  full_name='tutorial.Person.PhoneType',
  filename=None,
  file=DESCRIPTOR,
  values=[
    _descriptor.EnumValueDescriptor(
      name='MOBILE', index=0, number=0,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='HOME', index=1, number=1,
      options=None,
      type=None),
    _descriptor.EnumValueDescriptor(
      name='WORK', index=2, number=2,
      options=None,
      type=None),
  ],
  containing_type=None,
  options=None,
  serialized_start=207,
  serialized_end=250,
)
_sym_db.RegisterEnumDescriptor(_PERSON_PHONETYPE)


_PERSON_PHONENUMBER = _descriptor.Descriptor(
  name='PhoneNumber',
  full_name='tutorial.Person.PhoneNumber',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='number', full_name='tutorial.Person.PhoneNumber.number', index=0,
      number=1, type=9, cpp_type=9, label=2,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='type', full_name='tutorial.Person.PhoneNumber.type', index=1,
      number=2, type=14, cpp_type=8, label=1,
      has_default_value=True, default_value=1,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=128,
  serialized_end=205,
)

_PERSON = _descriptor.Descriptor(
  name='Person',
  full_name='tutorial.Person',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='name', full_name='tutorial.Person.name', index=0,
      number=1, type=9, cpp_type=9, label=2,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='id', full_name='tutorial.Person.id', index=1,
      number=2, type=5, cpp_type=1, label=2,
      has_default_value=False, default_value=0,
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='email', full_name='tutorial.Person.email', index=2,
      number=3, type=9, cpp_type=9, label=1,
      has_default_value=False, default_value=_b("").decode('utf-8'),
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
    _descriptor.FieldDescriptor(
      name='phone', full_name='tutorial.Person.phone', index=3,
      number=4, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[_PERSON_PHONENUMBER, ],
  enum_types=[
    _PERSON_PHONETYPE,
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=32,
  serialized_end=250,
)


_ADDRESSBOOK = _descriptor.Descriptor(
  name='AddressBook',
  full_name='tutorial.AddressBook',
  filename=None,
  file=DESCRIPTOR,
  containing_type=None,
  fields=[
    _descriptor.FieldDescriptor(
      name='person', full_name='tutorial.AddressBook.person', index=0,
      number=1, type=11, cpp_type=10, label=3,
      has_default_value=False, default_value=[],
      message_type=None, enum_type=None, containing_type=None,
      is_extension=False, extension_scope=None,
      options=None),
  ],
  extensions=[
  ],
  nested_types=[],
  enum_types=[
  ],
  options=None,
  is_extendable=False,
  syntax='proto2',
  extension_ranges=[],
  oneofs=[
  ],
  serialized_start=252,
  serialized_end=299,
)

_PERSON_PHONENUMBER.fields_by_name['type'].enum_type = _PERSON_PHONETYPE
_PERSON_PHONENUMBER.containing_type = _PERSON
_PERSON.fields_by_name['phone'].message_type = _PERSON_PHONENUMBER
_PERSON_PHONETYPE.containing_type = _PERSON
_ADDRESSBOOK.fields_by_name['person'].message_type = _PERSON
DESCRIPTOR.message_types_by_name['Person'] = _PERSON
DESCRIPTOR.message_types_by_name['AddressBook'] = _ADDRESSBOOK

Person = _reflection.GeneratedProtocolMessageType('Person', (_message.Message,), dict(

  PhoneNumber = _reflection.GeneratedProtocolMessageType('PhoneNumber', (_message.Message,), dict(
    DESCRIPTOR = _PERSON_PHONENUMBER,
    __module__ = 'addressbook_pb2'
    # @@protoc_insertion_point(class_scope:tutorial.Person.PhoneNumber)
    ))
  ,
  DESCRIPTOR = _PERSON,
  __module__ = 'addressbook_pb2'
  # @@protoc_insertion_point(class_scope:tutorial.Person)
  ))
_sym_db.RegisterMessage(Person)
_sym_db.RegisterMessage(Person.PhoneNumber)

AddressBook = _reflection.GeneratedProtocolMessageType('AddressBook', (_message.Message,), dict(
  DESCRIPTOR = _ADDRESSBOOK,
  __module__ = 'addressbook_pb2'
  # @@protoc_insertion_point(class_scope:tutorial.AddressBook)
  ))
_sym_db.RegisterMessage(AddressBook)


# @@protoc_insertion_point(module_scope)

Editar 1,

Tentoupip install protobuf, encontrou o seguinte erro,

Requirement already satisfied (use --upgrade to upgrade): protobuf in /Users/foo/miniconda2/lib/python2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): six>=1.9 in /Users/foo/miniconda2/lib/python2.7/site-packages/six-1.10.0-py2.7.egg (from protobuf)
Requirement already satisfied (use --upgrade to upgrade): setuptools in /Users/foo/miniconda2/lib/python2.7/site-packages (from protobuf)

Aqui está a saída da versão python,

python -V
Python 2.7.11 :: Continuum Analytics, Inc.

** Editar 2 **

Poste a mensagem de erro exata,

Traceback (most recent call last):
  File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevd.py", line 1531, in <module>
    globals = debugger.run(setup['file'], None, None, is_module)
  File "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevd.py", line 938, in run
    pydev_imports.execfile(file, globals, locals)  # execute the script
  File "/Users/foo/personal/featureExtraction/protobuf_test.py", line 1, in <module>
    from addressbook_pb2 import Person
  File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_monkey_qt.py", line 71, in patched_import
    return original_import(name, *args, **kwargs)
  File "/Users/foo/personal/featureExtraction/addressbook_pb2.py", line 6, in <module>
    from google.protobuf import descriptor as _descriptor
  File "/Applications/PyCharm CE.app/Contents/helpers/pydev/_pydev_bundle/pydev_monkey_qt.py", line 71, in patched_import
    return original_import(name, *args, **kwargs)
ImportError: No module named google.protobuf

Editar 3,

mensagem de erro quandoimport google,

Editar 4,

Saída dewhich pip,

which pip
/Users/foo/miniconda2/bin/pip

Saída desys.executable,

/ Usuários / foo / anaconda / bin / python

Editar 5,

foo-mn1:featureExtraction foo$ sudo /Users/foo/miniconda2/bin/pip install protobuf
Password:
The directory '/Users/foo/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/foo/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied (use --upgrade to upgrade): protobuf in /Users/foo/miniconda2/lib/python2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): six>=1.9 in /Users/foo/miniconda2/lib/python2.7/site-packages/six-1.10.0-py2.7.egg (from protobuf)
Requirement already satisfied (use --upgrade to upgrade): setuptools in /Users/foo/miniconda2/lib/python2.7/site-packages (from protobuf)
foo-mn1:featureExtraction foo$ sudo /Users/foo/miniconda2/bin/pip install google
The directory '/Users/foo/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/foo/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied (use --upgrade to upgrade): google in /Users/foo/miniconda2/lib/python2.7/site-packages
Requirement already satisfied (use --upgrade to upgrade): beautifulsoup4 in /Users/foo/miniconda2/lib/python2.7/site-packages (from google)