The Fix
Removed the non-existing `__author__` from the `__dir__` method in aiohttp, which was causing an AttributeError.
Based on closed aio-libs/aiohttp issue #9914 · PR/commit linked
@@ -0,0 +1 @@
@@ -0,0 +1 @@
+Removed non-existing ``__author__`` from ``dir(aiohttp)`` -- by :user:`Dreamsorcerer`.
diff --git a/aiohttp/__init__.py b/aiohttp/__init__.py
index b2c366efe49..f7864247791 100644
repro.py
<class 'aiohttp.client_exceptions.ServerTimeoutError'>
<class 'aiohttp.client_exceptions.SocketTimeoutError'>
<class 'aiohttp.streams.StreamReader'>
<class 'aiohttp.payload.StringIOPayload'>
<class 'aiohttp.payload.StringPayload'>
<class 'aiohttp.connector.TCPConnector'>
<class 'aiohttp.payload.TextIOPayload'>
<class 'aiohttp.resolver.ThreadedResolver'>
<class 'aiohttp.client_exceptions.TooManyRedirects'>
<class 'aiohttp.tracing.TraceConfig'>
<class 'aiohttp.tracing.TraceConnectionCreateEndParams'>
<class 'aiohttp.tracing.TraceConnectionCreateStartParams'>
<class 'aiohttp.tracing.TraceConnectionQueuedEndParams'>
<class 'aiohttp.tracing.TraceConnectionQueuedStartParams'>
<class 'aiohttp.tracing.TraceConnectionReuseconnParams'>
<class 'aiohttp.tracing.TraceDnsCacheHitParams'>
<class 'aiohttp.tracing.TraceDnsCacheMissParams'>
<class 'aiohttp.tracing.TraceDnsResolveHostEndParams'>
<class 'aiohttp.tracing.TraceDnsResolveHostStartParams'>
<class 'aiohttp.tracing.TraceRequestChunkSentParams'>
<class 'aiohttp.tracing.TraceRequestEndParams'>
<class 'aiohttp.tracing.TraceRequestExceptionParams'>
<class 'aiohttp.tracing.TraceRequestHeadersSentParams'>
<class 'aiohttp.tracing.TraceRequestRedirectParams'>
<class 'aiohttp.tracing.TraceRequestStartParams'>
<class 'aiohttp.tracing.TraceResponseChunkReceivedParams'>
<class 'aiohttp.connector.UnixConnector'>
<enum 'WSCloseCode'>
<class 'aiohttp.http_websocket.WSMessage'>
<enum 'WSMsgType'>
<class 'aiohttp.client_exceptions.WSServerHandshakeError'>
<class 'aiohttp.http_websocket.WebSocketError'>
*** AttributeError: module aiohttp has no attribute __author__
verify
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
fix.md
Option A — Apply the official fix\nRemoved the non-existing `__author__` from the `__dir__` method in aiohttp, which was causing an AttributeError.\nWhen NOT to use: Do not apply this fix if you rely on the `__author__` attribute being present.\n\n
Why This Fix Works in Production
- Trigger: raise AttributeError(f"module {__name__} has no attribute {name}")
- Mechanism: The `__author__` attribute was incorrectly included in the `__dir__` method of aiohttp
Why This Breaks in Prod
- Shows up under Python 3.12 in real deployments (not just unit tests).
- The `__author__` attribute was incorrectly included in the `__dir__` method of aiohttp
- Surfaces as: raise AttributeError(f"module {__name__} has no attribute {name}")
Proof / Evidence
- GitHub issue: #9914
- Fix PR: https://github.com/aio-libs/aiohttp/pull/9918
- Reproduced locally: No (not executed)
- Last verified: 2026-02-09
- Confidence: 0.80
- Did this fix it?: Yes (upstream fix exists)
- Own content ratio: 0.24
Discussion
High-signal excerpts from the issue thread (symptoms, repros, edge-cases).
“> dict(map(_to_tuple, filter(_is_valid_key, groupby(src, _extract_key)))) Seems like you expect us to guess what your code does?”
“Sorry, that's still not helping, I don't see what any of that has to do with aiohttp”
“Tried with pdb stack trace and see the below output - I tried to list the items here using for i in src: print(i) and…”
“Still rather unclear what you're trying to do”
Failure Signature (Search String)
- raise AttributeError(f"module {__name__} has no attribute {name}")
Error Message
Stack trace
error.txt
Error Message
-------------
raise AttributeError(f"module {__name__} has no attribute {name}")
AttributeError: module aiohttp has no attribute __author__
Stack trace
error.txt
Error Message
-------------
# destroy aiohttp.worker
Traceback (most recent call last):
File "<frozen runpy>", line 198, in _run_module_as_main
File "<frozen runpy>", line 88, in _run_code
File "/root/.virtual_environment/lib64/python3.12/site-packages/error_messages_pdf/cli/__main__.py", line 15, in <module>
cli()
File "/root/.virtual_environment/lib64/python3.12/site-packages/click/core.py", line 1157, in __call__
return self.main(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.virtual_environment/lib64/python3.12/site-packages/click/core.py", line 1078, in main
rv = self.invoke(ctx)
^^^^^^^^^^^^^^^^
File "/root/.virtual_environment/lib64/python3.12/site-packages/click/core.py", line 1688, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.virtual_environment/lib64/python3.12/site-packages/click/core.py", line 1434, in invoke
return ctx.invoke(self.callback, **ctx.params)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.virtual_environment/lib64/python3.12/site-packages/click/core.py", line 783, in invoke
return __callback(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/root/.virtual_environment/lib64/python3.12/site-packages/error_messages_pdf/cli/_internal/cmd_generate_pdf.py", line 39, in cmd_pdf
error_messages:
... (truncated) ...
Stack trace
error.txt
Error Message
-------------
>> dict(map(_to_tuple, filter(_is_valid_key, groupby(src, _extract_key))))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name '_to_tuple' is not defined
Minimal Reproduction
repro.py
<class 'aiohttp.client_exceptions.ServerTimeoutError'>
<class 'aiohttp.client_exceptions.SocketTimeoutError'>
<class 'aiohttp.streams.StreamReader'>
<class 'aiohttp.payload.StringIOPayload'>
<class 'aiohttp.payload.StringPayload'>
<class 'aiohttp.connector.TCPConnector'>
<class 'aiohttp.payload.TextIOPayload'>
<class 'aiohttp.resolver.ThreadedResolver'>
<class 'aiohttp.client_exceptions.TooManyRedirects'>
<class 'aiohttp.tracing.TraceConfig'>
<class 'aiohttp.tracing.TraceConnectionCreateEndParams'>
<class 'aiohttp.tracing.TraceConnectionCreateStartParams'>
<class 'aiohttp.tracing.TraceConnectionQueuedEndParams'>
<class 'aiohttp.tracing.TraceConnectionQueuedStartParams'>
<class 'aiohttp.tracing.TraceConnectionReuseconnParams'>
<class 'aiohttp.tracing.TraceDnsCacheHitParams'>
<class 'aiohttp.tracing.TraceDnsCacheMissParams'>
<class 'aiohttp.tracing.TraceDnsResolveHostEndParams'>
<class 'aiohttp.tracing.TraceDnsResolveHostStartParams'>
<class 'aiohttp.tracing.TraceRequestChunkSentParams'>
<class 'aiohttp.tracing.TraceRequestEndParams'>
<class 'aiohttp.tracing.TraceRequestExceptionParams'>
<class 'aiohttp.tracing.TraceRequestHeadersSentParams'>
<class 'aiohttp.tracing.TraceRequestRedirectParams'>
<class 'aiohttp.tracing.TraceRequestStartParams'>
<class 'aiohttp.tracing.TraceResponseChunkReceivedParams'>
<class 'aiohttp.connector.UnixConnector'>
<enum 'WSCloseCode'>
<class 'aiohttp.http_websocket.WSMessage'>
<enum 'WSMsgType'>
<class 'aiohttp.client_exceptions.WSServerHandshakeError'>
<class 'aiohttp.http_websocket.WebSocketError'>
*** AttributeError: module aiohttp has no attribute __author__
Environment
- Python: 3.12
Why It Broke
The `__author__` attribute was incorrectly included in the `__dir__` method of aiohttp
Fix Options (Details)
Option A — Apply the official fix
Removed the non-existing `__author__` from the `__dir__` method in aiohttp, which was causing an AttributeError.
When NOT to use: Do not apply this fix if you rely on the `__author__` attribute being present.
Fix reference: https://github.com/aio-libs/aiohttp/pull/9918
Last verified: 2026-02-09. Validate in your environment.
When NOT to Use This Fix
- Do not apply this fix if you rely on the `__author__` attribute being present.
Verify Fix
verify
Re-run the minimal reproduction on your broken version, then apply the fix and re-run.
Did This Fix Work in Your Case?
Quick signal helps us prioritize which fixes to verify and improve.
Prevention
- Track RSS + object counts after deployments; alert on monotonic growth and GC pressure.
- Add a long-running test that repeats the failing call path and asserts stable memory.
Related Issues
No related fixes found.
Sources
We don’t republish the full GitHub discussion text. Use the links above for context.