Mypy and autorest

[chaen]

Autorest is tricky for mypy because it dynamically loads up patches.
While trying to bend the arms of both of them to get something sensible, I saw that there is a post processing step of autorest which should solve our problem:

https://github.com/Azure/autorest.python/blob/main/docs/customizations.md#postprocessing-optional

It's being used by Azure:
https://github.com/Azure/azure-sdk-for-python/blob/200f57e6459a5b5a240e76bb2d661e5cc17181b1/tools/azure-sdk-tools/packaging_tools/generate_client.py#L26C42-L26C53

Azure/azure-sdk-for-python#34695
Not perfect though...
Azure/autorest.python#1465

If I try to run it now, I get

$ autorest --python --postprocess --output-folder="/home/chaen/dirac/diracx-project/diracx/diracx-client/src/diracx/client/generated" --namespace=generated
AutoRest code generation utility [cli version: 3.7.1; node: v22.9.0]
(C) 2018 Microsoft Corporation.
https://aka.ms/autorest
info    | AutoRest core version selected from configuration: ^3.7.0.
(node:275682) [DEP0060] DeprecationWarning: The `util._extend` API is deprecated. Please use Object.assign() instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
info    |    Loading AutoRest core      '/home/chaen/.autorest/@[email protected]/nodemodules/@autorest/core/dist' (3.10.0)
info    |    Loading AutoRest extension '@autorest/python' (latest->6.23.0)
info    |    Loading AutoRest extension '@autorest/modelerfour' (~4.23.5->4.23.7)
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/home/chaen/.autorest/@[email protected]/node_modules/@autorest/python/generator/pygen/postprocess/get_all.py", line 16, in <module>
    patched = ",".join(main(sys.argv[1]))
                       ^^^^^^^^^^^^^^^^^
  File "/home/chaen/.autorest/@[email protected]/node_modules/@autorest/python/generator/pygen/postprocess/get_all.py", line 11, in main
    sdk = importlib.import_module(namespace)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/chaen/mambaforge/envs/gubbins-dev/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1384, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1298, in _sanity_check
ValueError: Empty module name
Error: Command failed: python3 ./scripts/start.py
fatal   | Process() cancelled due to failure 
error   | [Exception] AutoRest extension '@autorest/python' terminated.
error   |   Error: [Exception] AutoRest extension '@autorest/python' terminated.
error   | Autorest completed with an error. If you think the error message is unclear, or is a bug, please declare an issues at https://github.com/Azure/autorest/issues with the error message you are seeing.

To be investigated