[Python] `Builder` object has no attribute `CreateVectorOfTables`

[RCRalph]

Greetings,

I'm having issues with using code generated for the Python language.
Specifically, if I use a nested table in my schema, the following code is generated:

def MyTableCreateValuesVector(builder: flatbuffers.Builder, data: Iterable[Any]) -> int:
    return builder.CreateVectorOfTables(data)

Unfortunately, when I try to use this method, I get the following error:

'Builder' object has no attribute 'CreateVectorOfTables'

I'm using FlatBuffers version 25.12.19

> flatc --version
flatc version 25.12.19
> uv pip show flatbuffers
Name: flatbuffers
Version: 25.12.19
Location: [CWD]/.venv/lib/python3.13/site-packages
Requires:
Required-by: [my-package]

Code generation

You can reproduce the issue with the following schema:

namespace Example;

table NestedTable {
  value:uint64;
}

table MyTable {
  values:[NestedTable];
}

root_type MyTable;

I used the following command to generate the code:

flatc --python --python-typing example.fbs

Example script which replicates the issue:

import flatbuffers

import Example.NestedTable
import Example.MyTable

builder = flatbuffers.Builder()

Example.NestedTable.NestedTableStart(builder)
Example.NestedTable.NestedTableAddValue(builder, 10)
nested_table = Example.NestedTable.NestedTableEnd(builder)

nested_table_vector = Example.MyTable.MyTableCreateValuesVector(builder, [nested_table])  # <--- Fails here

Example.MyTable.MyTableStart(builder)
Example.MyTable.MyTableAddValues(builder, nested_table_vector)
my_table = Example.MyTable.MyTableEnd(builder)

builder.Finish(my_table)

Observations

From what I've seen in the repository, it seems like this method is present and all is well.
Unfortunately, when I download the package from PyPI, this method doesn't exist.

Could you please check if you are publishing the correct version of the package?
I looked into recent releases and it seems like this method is missing in all of them.

Manually replacing the builder.py file's content with what exists in the repository fixes the issue.

Thanks :3

[b-van-b]

I have encountered this issue in the tutorial, using the flatbuffers 25.12.19 package from PyPI in Python 3.14.0. At https://flatbuffers.dev/tutorial/#python_5 , the line weapons = MyGame.Sample.Monster.CreateWeaponsVector(builder, [sword, axe]) results in the following error:

Traceback (most recent call last):
  File "<python-input-11>", line 1, in <module>
    weapons = MyGame.Sample.Monster.CreateWeaponsVector(builder, [sword, axe])
  File "C:\code\python\flatbuffertest\MyGame\Sample\Monster.py", line 233, in CreateWeaponsVector
    MonsterCreateWeaponsVector(builder, data)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "C:\code\python\flatbuffertest\MyGame\Sample\Monster.py", line 230, in MonsterCreateWeaponsVector
    return builder.CreateVectorOfTables(data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'Builder' object has no attribute 'CreateVectorOfTables'

[jtdavis777]

hmm. @fliiiix could you help me look into this one? Is this another issue with the latest release CI?

[fliiiix]

The release via pipeline failed: https://github.com/google/flatbuffers/actions/runs/20385042746/job/58584135774
I assume @dbaileychess pushed the package manually and by accident from an older commit which did not include the new feature.

I also pushed some small fixes for warnings i fixed while looking at this: #8955

Ideally someone creates a new release soon which fixes this or the pip package should be pushed manually again in a fixed state.

[jtdavis777]

Yeah I think I need to collect up all the release issues wit 25.12.19 and see about trying to get a better release cut soon.