AttributeError: 'AsyncLock' object has no attribute '_anyio_lock'

[T-256]

Try install httpx + httpcore 1.0 then remove anyio. Error:

(.venv) E:\hcore1>python app.py
Traceback (most recent call last):
  File "E:\hcore1\app.py", line 6, in main
    r = await client.get('https://www.example.com/')
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 1757, in get
    return await self.request(
           ^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 1530, in request
    return await self.send(request, auth=auth, follow_redirects=follow_redirects)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 1617, in send
    response = await self._send_handling_auth(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 1645, in _send_handling_auth
    response = await self._send_handling_redirects(
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 1682, in _send_handling_redirects
    response = await self._send_single_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 1719, in _send_single_request
    response = await transport.handle_async_request(request)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_transports\default.py", line 366, in handle_async_request
    resp = await self._pool.handle_async_request(req)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\hcore1\.venv\Lib\site-packages\httpcore\_async\connection_pool.py", line 224, in handle_async_request
    async with self._pool_lock:
  File "E:\hcore1\.venv\Lib\site-packages\httpcore\_synchronization.py", line 62, in __aenter__
    self.setup()
  File "E:\hcore1\.venv\Lib\site-packages\httpcore\_synchronization.py", line 55, in setup
    raise RuntimeError(
RuntimeError: Running with asyncio requires installation of 'httpcore[asyncio]'.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "E:\hcore1\app.py", line 8, in <module>
    asyncio.run(main())
  File "C:\Users\User\.rye\py\[email protected]\install\Lib\asyncio\runners.py", line 194, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "C:\Users\User\.rye\py\[email protected]\install\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\User\.rye\py\[email protected]\install\Lib\asyncio\base_events.py", line 664, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "E:\hcore1\app.py", line 5, in main
    async with httpx.AsyncClient() as client:
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_client.py", line 2003, in __aexit__
    await self._transport.__aexit__(exc_type, exc_value, traceback)
  File "E:\hcore1\.venv\Lib\site-packages\httpx\_transports\default.py", line 345, in __aexit__
    await self._pool.__aexit__(exc_type, exc_value, traceback)
  File "E:\hcore1\.venv\Lib\site-packages\httpcore\_async\connection_pool.py", line 327, in __aexit__
    await self.aclose()
  File "E:\hcore1\.venv\Lib\site-packages\httpcore\_async\connection_pool.py", line 312, in aclose
    async with self._pool_lock:
  File "E:\hcore1\.venv\Lib\site-packages\httpcore\_synchronization.py", line 67, in __aenter__
    await self._anyio_lock.acquire()
          ^^^^^^^^^^^^^^^^
AttributeError: 'AsyncLock' object has no attribute '_anyio_lock'

(.venv) E:\hcore1>

Originally posted by @T-256 in encode/httpx#2885 (comment)

[tomchristie]

Here's the same thing slimmed down to just an httpcore example...

example.py

import httpcore
import asyncio


async def main():
    async with httpcore.AsyncConnectionPool() as pool:
        response = await pool.request("GET", "https://www.example.com")
        print(response)


asyncio.run(main())

console:

$ python3 -m venv venv
$ venv/bin/pip install httpcore[asyncio]
$ venv/bin/pip uninstall anyio
$ venv/bin/python example.py
Traceback (most recent call last):
  File "/Users/tomchristie/Temp/./example.py", line 7, in main
    response = await pool.request("GET", "https://www.example.com")
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_async/interfaces.py", line 43, in request
    response = await self.handle_async_request(request)
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_async/connection_pool.py", line 224, in handle_async_request
    async with self._pool_lock:
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_synchronization.py", line 62, in __aenter__
    self.setup()
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_synchronization.py", line 55, in setup
    raise RuntimeError(
RuntimeError: Running with asyncio requires installation of 'httpcore[asyncio]'.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/tomchristie/Temp/./example.py", line 11, in <module>
    asyncio.run(main())
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/Library/Frameworks/Python.framework/Versions/3.10/lib/python3.10/asyncio/base_events.py", line 649, in run_until_complete
    return future.result()
  File "/Users/tomchristie/Temp/./example.py", line 6, in main
    async with httpcore.AsyncConnectionPool() as pool:
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_async/connection_pool.py", line 327, in __aexit__
    await self.aclose()
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_async/connection_pool.py", line 312, in aclose
    async with self._pool_lock:
  File "/Users/tomchristie/Temp/venv/lib/python3.10/site-packages/httpcore/_synchronization.py", line 67, in __aenter__
    await self._anyio_lock.acquire()
AttributeError: 'AsyncLock' object has no attribute '_anyio_lock'

This is okay... can see an appropriate RuntimeError when we deliberately break the installation, but it could be neater.

---

edit:

A better replication of this...

$ python3 -m venv venv
$ venv/bin/pip install httpcore  # Intention was to install `httpcore[asyncio]`
$ venv/bin/python example.py

[chamikabm]

The same thing happened to me with the following dependencies, with httpx

httpx==0.25.0 sniffio==1.3.0 certifi==2023.7.22 idna==3.4 httpcore==0.18.0 anyio>=3.0,<5.0

Error:
graphql-async-test-service | File "/app/graphql_service/manager_libraries/base.py", line 119, in async_http_request graphql-async-test-service | resp = await httpx_client(*args, **kwargs) graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_client.py", line 1848, in post graphql-async-test-service | return await self.request( graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_client.py", line 1530, in request graphql-async-test-service | return await self.send(request, auth=auth, follow_redirects=follow_redirects) graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_client.py", line 1617, in send graphql-async-test-service | response = await self._send_handling_auth( graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_client.py", line 1645, in _send_handling_auth graphql-async-test-service | response = await self._send_handling_redirects( graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_client.py", line 1682, in _send_handling_redirects graphql-async-test-service | response = await self._send_single_request(request) graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_client.py", line 1719, in _send_single_request graphql-async-test-service | response = await transport.handle_async_request(request) graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpx/_transports/default.py", line 366, in handle_async_request graphql-async-test-service | resp = await self._pool.handle_async_request(req) graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpcore/_async/connection_pool.py", line 224, in handle_async_request graphql-async-test-service | async with self._pool_lock: graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpcore/_synchronization.py", line 48, in __aenter__ graphql-async-test-service | self.setup() graphql-async-test-service | File "/usr/local/lib/python3.9/site-packages/httpcore/_synchronization.py", line 41, in setup graphql-async-test-service | raise RuntimeError( graphql-async-test-service | RuntimeError: Running under asyncio requires the 'anyio' package to be installed.