More information on this error.
I am using a python virtual environment.
<path to virtual
environment>/lib/python3.10/site-packages/google/protobuf/message_factory.py
Message Factory does exist in the python virtual environment.
GetMessageClass function is defined in the message_factory.py file.
```
def GetMessageClass(descriptor):
"""Obtains a proto2 message class based on the passed in descriptor.
Passing a descriptor with a fully qualified name matching a previous
invocation will cause the same class to be returned.
Args:
descriptor: The descriptor to build from.
Returns:
A class describing the passed in descriptor.
"""
concrete_class = getattr(descriptor, '_concrete_class', None)
if concrete_class:
return concrete_class
return _InternalCreateMessageClass(descriptor)
```
On Monday, January 5, 2026 at 6:49:43 AM UTC-7 Pablo Camacho wrote:
> Hi,
>
> I am trying to update python code to use a newer protobuf version: 6.33.2.
>
> I replaced GetPrototype with GetMessageClass.
>
> I get this error.
> AttributeError: 'MessageFactory' object has no attribute 'GetMessageClass'
>
> I believe that GetMessageClass is supposed to be defined in message
> factory since version 4. I am confused about why I get this error.
>
> What else could be causing this error? What should I look into?
>
> Also, the protobuf files were made with an older version of protobuf.
> Would there be problems with trying to use a newer version of protobuf to
> read protobuf files made by an older version of protobuf?
>
> protoc version: libprotoc 33.1
> python version: 3.10.12
> protobuf version: 6.33.2.
>
>
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