I got this problem too! Can you explain why your first attemp generate 
"wrong" file ?
在2023年8月1日星期二 UTC+8 22:32:49<Nikita Ig> 写道:

>
> Oh, I'm so sorry. I can understand my problems. I suppose that 
> conversation may close and delete.
> On Tuesday, 1 August 2023 at 16:04:49 UTC+3 Nikita Ig wrote:
>
>> I installed protoc to my ubuntu and got version libprotoc 3.12.4
>> I reproduce all my steps and got typical example of pb2.py file consisted 
>> all data
>>
>> # -*- coding: utf-8 -*-
>> # Generated by the protocol buffer compiler.  DO NOT EDIT!
>> # source: test.proto
>>
>> 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
>> # @@protoc_insertion_point(imports)
>>
>> _sym_db = _symbol_database.Default()
>>
>>
>>
>>
>> DESCRIPTOR = _descriptor.FileDescriptor(
>>   name='test.proto',
>>   package='',
>>   syntax='proto3',
>>   serialized_options=None,
>>   create_key=_descriptor._internal_create_key,
>>   
>> serialized_pb=b'\n\ntest.proto\"M\n\rSearchRequest\x12\r\n\x05query\x18\x01 
>> \x01(\t\x12\x13\n\x0bpage_number\x18\x02 
>> \x01(\x05\x12\x18\n\x10results_per_page\x18\x03 \x01(\x05\x62\x06proto3'
>> )
>>
>>
>>
>>
>> _SEARCHREQUEST = _descriptor.Descriptor(
>>   name='SearchRequest',
>>   full_name='SearchRequest',
>>   filename=None,
>>   file=DESCRIPTOR,
>>   containing_type=None,
>>   create_key=_descriptor._internal_create_key,
>>   fields=[
>>     _descriptor.FieldDescriptor(
>>       name='query', full_name='SearchRequest.query', index=0,
>>       number=1, 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,
>>       serialized_options=None, file=DESCRIPTOR, 
>>  create_key=_descriptor._internal_create_key),
>>     _descriptor.FieldDescriptor(
>>       name='page_number', full_name='SearchRequest.page_number', index=1,
>>       number=2, type=5, cpp_type=1, label=1,
>>       has_default_value=False, default_value=0,
>>       message_type=None, enum_type=None, containing_type=None,
>>       is_extension=False, extension_scope=None,
>>       serialized_options=None, file=DESCRIPTOR, 
>>  create_key=_descriptor._internal_create_key),
>>     _descriptor.FieldDescriptor(
>>       name='results_per_page', 
>> full_name='SearchRequest.results_per_page', index=2,
>>       number=3, type=5, cpp_type=1, label=1,
>>       has_default_value=False, default_value=0,
>>       message_type=None, enum_type=None, containing_type=None,
>>       is_extension=False, extension_scope=None,
>>       serialized_options=None, file=DESCRIPTOR, 
>>  create_key=_descriptor._internal_create_key),
>>   ],
>>   extensions=[
>>   ],
>>   nested_types=[],
>>   enum_types=[
>>   ],
>>   serialized_options=None,
>>   is_extendable=False,
>>   syntax='proto3',
>>   extension_ranges=[],
>>   oneofs=[
>>   ],
>>   serialized_start=14,
>>   serialized_end=91,
>> )
>>
>> DESCRIPTOR.message_types_by_name['SearchRequest'] = _SEARCHREQUEST
>> _sym_db.RegisterFileDescriptor(DESCRIPTOR)
>>
>> SearchRequest = _reflection.GeneratedProtocolMessageType('SearchRequest', 
>> (_message.Message,), {
>>   'DESCRIPTOR' : _SEARCHREQUEST,
>>   '__module__' : 'test_pb2'
>>   # @@protoc_insertion_point(class_scope:SearchRequest)
>>   })
>> _sym_db.RegisterMessage(SearchRequest)
>>
>>
>> # @@protoc_insertion_point(module_scope)
>>
>>
>> And I have a question  - what did I wrong in my first attempt? Is it a 
>> new version of protoc? or is it a problem in my Windows? Or anything else?
>> On Tuesday, 1 August 2023 at 14:35:32 UTC+3 Nikita Ig wrote:
>>
>>> Hello. I'm a rookie in protocol buffers and I'm trying to repeat example 
>>> from documentation.
>>>
>>> Step 1. Installed protoc
>>> Step 2. Created test.proto file consisted this code:
>>> syntax = "proto3";
>>>
>>> message SearchRequest {
>>>   string query = 1;
>>>   int32 page_number = 2;
>>>   int32 results_per_page = 3;
>>> }
>>> Step 3. I ran protoc with help command:
>>> protoc.exe --proto_path=${PWD}/protobuf --python_out=${PWD}/protobuf/ 
>>> ${PWD}/protobuf/test.proto
>>>
>>> Step 4. I got test_pb2.py file consisted this code:
>>> # -*- coding: utf-8 -*-
>>> # Generated by the protocol buffer compiler.  DO NOT EDIT!
>>> # source: test.proto
>>> """Generated protocol buffer code."""
>>> from google.protobuf import descriptor as _descriptor
>>> from google.protobuf import descriptor_pool as _descriptor_pool
>>> from google.protobuf import symbol_database as _symbol_database
>>> from google.protobuf.internal import builder as _builder
>>> # @@protoc_insertion_point(imports)
>>>
>>> _sym_db = _symbol_database.Default()
>>>
>>>
>>>
>>>
>>> DESCRIPTOR = 
>>> _descriptor_pool.Default().AddSerializedFile(b'\n\ntest.proto\"M\n\rSearchRequest\x12\r\n\x05query\x18\x01
>>>  
>>> \x01(\t\x12\x13\n\x0bpage_number\x18\x02 
>>> \x01(\x05\x12\x18\n\x10results_per_page\x18\x03 \x01(\x05\x62\x06proto3')
>>>
>>> _globals = globals()
>>> _builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, _globals)
>>> _builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'test_pb2', _globals)
>>> if _descriptor._USE_C_DESCRIPTORS == False:
>>>
>>>   DESCRIPTOR._options = None
>>>   _globals['_SEARCHREQUEST']._serialized_start=14
>>>   _globals['_SEARCHREQUEST']._serialized_end=91
>>> # @@protoc_insertion_point(module_scope)
>>>
>>> But documentation said about other format file for python generated file 
>>> and I have no idea what I need to import in my producer for create message 
>>> object. Generated file didn't contain any classes or something other entity 
>>> for import.
>>>
>>> Thanks for any help.
>>>
>>

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