`ModuleNotFoundError: No module named 'rsa'` because of `Testbed` import

[phorward]

This issue was already solved in viur-framework/viur-core#1695, now happens in viur-toolkit as well.

[2026-06-23 10:34:39,716] modules/__init__.py:50 [ERROR] Unable to import 'question'
Traceback (most recent call last):
  File "~/myproject/deploy/modules/__init__.py", line 34, in _import_modules
    _import = __import__(_module, globals(), locals(), [_module], level=1)
  File "~/myproject/deploy/modules/question.py", line 5, in <module>
    from viur.toolkit.importer import Importable
  File "~/myproject/.venv/lib/python3.13/site-packages/viur/toolkit/__init__.py", line 10, in <module>
    from .memcache import *
  File "~/myproject/.venv/lib/python3.13/site-packages/viur/toolkit/memcache.py", line 6, in <module>
    from google.appengine.ext.testbed import Testbed
  File "~/myproject/.venv/lib/python3.13/site-packages/google/appengine/ext/testbed/__init__.py", line 127, in <module>
    from google.appengine.api.app_identity import app_identity_stub
  File "~/myproject/.venv/lib/python3.13/site-packages/google/appengine/api/app_identity/app_identity_stub.py", line 35, in <module>
    from google.appengine.api.app_identity import app_identity_defaultcredentialsbased_stub as ai_default_stub
  File "~/myproject/.venv/lib/python3.13/site-packages/google/appengine/api/app_identity/app_identity_defaultcredentialsbased_stub.py", line 31, in <module>
    from google.appengine.api.app_identity import app_identity_stub_base
  File "~/myproject/.venv/lib/python3.13/site-packages/google/appengine/api/app_identity/app_identity_stub_base.py", line 42, in <module>
    import rsa
ModuleNotFoundError: No module named 'rsa'

[sveneberth]

The import is in appengine-python-standard, not in viur-toolkit. The problem is solved by appengine-python-standard==2.0.1, see GoogleCloudPlatform/appengine-python-standard#145 . But an upgrade to it is not possible due to the version limits in viur-core. I created PR viur-framework/viur-core#1716 to fix this.