#36650: oracledb-3.4.0 -> TypeError: isinstance() arg 2 must be a type, a tuple
of
types, or a union
-------------------------------------+-------------------------------------
Reporter: MV | Owner: (none)
Type: Uncategorized | Status: new
Component: Database layer | Version: 5.2
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
-------------------------------------+-------------------------------------
Description changed by MV:
Old description:
> When upgrading oracledb to version 3.4.0, Django stops working with error
> "TypeError: isinstance() arg 2 must be a type, a tuple of types, or a
> union."
>
> Using oracledb-3.3.0 works as expected.
>
> ...
> Performing system checks...
>
> System check identified no issues (0 silenced).
> 2025-10-08 09:18:33,020: INFO: acst_app.models.file: 10001
> 2025-10-08 09:18:33,023: INFO: acst_app.models.file: 10001 elapsed time
> 00m00s
> Exception in thread django-main-thread:
> Traceback (most recent call last):
> File "/root/.pyenv/versions/3.13.7/lib/python3.13/threading.py", line
> 1043, in _bootstrap_inner
> self.run()
> ~~~~~~~~^^
> File "/root/.pyenv/versions/3.13.7/lib/python3.13/threading.py", line
> 994, in run
> self._target(*self._args, **self._kwargs)
> ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/utils/autoreload.py", line 64, in wrapper
> fn(*args, **kwargs)
> ~~^^^^^^^^^^^^^^^^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/core/management/commands/runserver.py", line 137, in
> inner_run
> self.check_migrations()
> ~~~~~~~~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/core/management/base.py", line 587, in check_migrations
> executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/migrations/executor.py", line 18, in __init__
> self.loader = MigrationLoader(self.connection)
> ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/migrations/loader.py", line 58, in __init__
> self.build_graph()
> ~~~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/migrations/loader.py", line 235, in build_graph
> self.applied_migrations = recorder.applied_migrations()
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/migrations/recorder.py", line 89, in
> applied_migrations
> if self.has_table():
> ~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/migrations/recorder.py", line 63, in has_table
> with self.connection.cursor() as cursor:
> ~~~~~~~~~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/utils/asyncio.py", line 26, in inner
> return func(*args, **kwargs)
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/base/base.py", line 320, in cursor
> return self._cursor()
> ~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/base/base.py", line 296, in _cursor
> self.ensure_connection()
> ~~~~~~~~~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/utils/asyncio.py", line 26, in inner
> return func(*args, **kwargs)
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/base/base.py", line 279, in ensure_connection
> self.connect()
> ~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/utils/asyncio.py", line 26, in inner
> return func(*args, **kwargs)
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/base/base.py", line 258, in connect
> self.init_connection_state()
> ~~~~~~~~~~~~~~~~~~~~~~~~~~^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/oracle/base.py", line 336, in
> init_connection_state
> cursor.execute(
> ~~~~~~~~~~~~~~^
> "SELECT 1 FROM DUAL WHERE DUMMY %s"
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> % self._standard_operators["contains"],
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> ["X"],
> ^^^^^^
> )
> ^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/oracle/base.py", line 630, in execute
> query, params = self._fix_for_params(query, params,
> unify_by_values=True)
> ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/oracle/base.py", line 627, in _fix_for_params
> return query, self._format_params(params)
> ~~~~~~~~~~~~~~~~~~~^^^^^^^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/oracle/base.py", line 555, in _format_params
> return {k: OracleParam(v, self, True) for k, v in params.items()}
> ~~~~~~~~~~~^^^^^^^^^^^^^^^
> File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
> packages/django/db/backends/oracle/base.py", line 441, in __init__
> elif isinstance(param, (Database.Binary, datetime.timedelta)):
> ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> TypeError: isinstance() arg 2 must be a type, a tuple of types, or a
> union
New description:
When upgrading oracledb to version 3.4.0, Django stops working with error
"TypeError: isinstance() arg 2 must be a type, a tuple of types, or a
union."
Using oracledb-3.3.0 works as expected.
``
Performing system checks...
System check identified no issues (0 silenced).
2025-10-08 09:18:33,020: INFO: acst_app.models.file: 10001
2025-10-08 09:18:33,023: INFO: acst_app.models.file: 10001 elapsed time
00m00s
Exception in thread django-main-thread:
Traceback (most recent call last):
File "/root/.pyenv/versions/3.13.7/lib/python3.13/threading.py", line
1043, in _bootstrap_inner
self.run()
~~~~~~~~^^
File "/root/.pyenv/versions/3.13.7/lib/python3.13/threading.py", line
994, in run
self._target(*self._args, **self._kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/utils/autoreload.py", line 64, in wrapper
fn(*args, **kwargs)
~~^^^^^^^^^^^^^^^^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/core/management/commands/runserver.py", line 137, in
inner_run
self.check_migrations()
~~~~~~~~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/core/management/base.py", line 587, in check_migrations
executor = MigrationExecutor(connections[DEFAULT_DB_ALIAS])
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/migrations/executor.py", line 18, in __init__
self.loader = MigrationLoader(self.connection)
~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/migrations/loader.py", line 58, in __init__
self.build_graph()
~~~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/migrations/loader.py", line 235, in build_graph
self.applied_migrations = recorder.applied_migrations()
~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/migrations/recorder.py", line 89, in applied_migrations
if self.has_table():
~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/migrations/recorder.py", line 63, in has_table
with self.connection.cursor() as cursor:
~~~~~~~~~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/base/base.py", line 320, in cursor
return self._cursor()
~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/base/base.py", line 296, in _cursor
self.ensure_connection()
~~~~~~~~~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/base/base.py", line 279, in ensure_connection
self.connect()
~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/utils/asyncio.py", line 26, in inner
return func(*args, **kwargs)
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/base/base.py", line 258, in connect
self.init_connection_state()
~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/oracle/base.py", line 336, in
init_connection_state
cursor.execute(
~~~~~~~~~~~~~~^
"SELECT 1 FROM DUAL WHERE DUMMY %s"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
% self._standard_operators["contains"],
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
["X"],
^^^^^^
)
^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/oracle/base.py", line 630, in execute
query, params = self._fix_for_params(query, params,
unify_by_values=True)
~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/oracle/base.py", line 627, in _fix_for_params
return query, self._format_params(params)
~~~~~~~~~~~~~~~~~~~^^^^^^^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/oracle/base.py", line 555, in _format_params
return {k: OracleParam(v, self, True) for k, v in params.items()}
~~~~~~~~~~~^^^^^^^^^^^^^^^
File "/root/.pyenv/versions/django_acst_venv_3137/lib/python3.13/site-
packages/django/db/backends/oracle/base.py", line 441, in __init__
elif isinstance(param, (Database.Binary, datetime.timedelta)):
~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: isinstance() arg 2 must be a type, a tuple of types, or a union
``
--
--
Ticket URL: <https://code.djangoproject.com/ticket/36650#comment:1>
Django <https://code.djangoproject.com/>
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