Missing module h11

[AndreaVidali]

Hello everyone,

I am trying to use httpx, but when I import it with import httpx, I am getting the error No module named h11 coming from the dependency httpcore.

I tried all httpx versions from 0.25.0 onwards.

You can see the full log here:

Python 3.10.11 (main, Aug  8 2023, 12:28:27) [Clang 14.0.3 (clang-1403.0.22.14.1)]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.11.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import httpx
---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
Cell In[1], line 1
----> 1 import httpx

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpx/__init__.py:2
      1 from .__version__ import __description__, __title__, __version__
----> 2 from ._api import delete, get, head, options, patch, post, put, request, stream
      3 from ._auth import Auth, BasicAuth, DigestAuth, NetRCAuth
      4 from ._client import USE_CLIENT_DEFAULT, AsyncClient, Client

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpx/_api.py:6
      3 import typing
      4 from contextlib import contextmanager
----> 6 from ._client import Client
      7 from ._config import DEFAULT_TIMEOUT_CONFIG
      8 from ._models import Response

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpx/_client.py:32
     30 from ._transports.asgi import ASGITransport
     31 from ._transports.base import AsyncBaseTransport, BaseTransport
---> 32 from ._transports.default import AsyncHTTPTransport, HTTPTransport
     33 from ._transports.wsgi import WSGITransport
     34 from ._types import (
     35     AsyncByteStream,
     36     AuthTypes,
   (...)
     50     VerifyTypes,
     51 )

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpx/_transports/default.py:32
     29 import typing
     30 from types import TracebackType
---> 32 import httpcore
     34 from .._config import DEFAULT_LIMITS, Limits, Proxy, create_ssl_context
     35 from .._exceptions import (
     36     ConnectError,
     37     ConnectTimeout,
   (...)
     49     WriteTimeout,
     50 )

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpcore/__init__.py:1
----> 1 from ._api import request, stream
      2 from ._async import (
      3     AsyncConnectionInterface,
      4     AsyncConnectionPool,
   (...)
      9     AsyncSOCKSProxy,
     10 )
     11 from ._backends.base import (
     12     SOCKET_OPTION,
     13     AsyncNetworkBackend,
   (...)
     16     NetworkStream,
     17 )

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpcore/_api.py:5
      2 from typing import Iterator, Optional, Union
      4 from ._models import URL, Extensions, HeaderTypes, Response
----> 5 from ._sync.connection_pool import ConnectionPool
      8 def request(
      9     method: Union[bytes, str],
     10     url: Union[URL, bytes, str],
   (...)
     14     extensions: Optional[Extensions] = None,
     15 ) -> Response:
     16     """
     17     Sends an HTTP request, returning the response.
     18
   (...)
     36         An instance of `httpcore.Response`.
     37     """

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpcore/_sync/__init__.py:1
----> 1 from .connection import HTTPConnection
      2 from .connection_pool import ConnectionPool
      3 from .http11 import HTTP11Connection

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpcore/_sync/connection.py:14
     12 from .._synchronization import Lock
     13 from .._trace import Trace
---> 14 from .http11 import HTTP11Connection
     15 from .interfaces import ConnectionInterface
     17 RETRIES_BACKOFF_FACTOR = 0.5  # 0s, 0.5s, 1s, 2s, 4s, etc.

File ~/Documents/projects/dummy/.venv/lib/python3.10/site-packages/httpcore/_sync/http11.py:17
      5 from types import TracebackType
      6 from typing import (
      7     Any,
      8     Iterable,
   (...)
     14     Union,
     15 )
---> 17 import h11
     19 from .._backends.base import NetworkStream
     20 from .._exceptions import (
     21     ConnectionNotAvailable,
     22     LocalProtocolError,
   (...)
     25     map_exceptions,
     26 )

ModuleNotFoundError: No module named 'h11'

[tomchristie]

Odd. How are you installing httpx?

[AndreaVidali]

I didn't answer the question, I am sorry. The answer is: with poetry, though a private repository with the parameter priority = 'default'.

[AndreaVidali]

I did quite a bit of investigation, it turns out it's a poetry/pkginfo issue. The related issue is python-poetry/poetry#9294. As you can see in the linked issue, httpcore is mentioned.

I am sorry I opened this discussion in the wrong place. You can close it, in my opinion. Thanks!

[tomchristie]

Ah okay, yes I can see that it's a poetry issue.

I'd like to understand what the resolution is tho, since it's impacting us.

From this comment... python-poetry/poetry#9301 (comment)

Is ensuring you've got the latest version of poetry sufficient to resolve this?

[AndreaVidali]

Is ensuring you've got the latest version of poetry sufficient to resolve this?

Unfortunately, not in my case.

From my understanding, to fix the issue, the version of pkginfo needs to be >= 1.10, but the latest version of poetry (1.8.2 at the time of writing) ships with pkginfo 1.9.6.

pkginfo is already set to ^1.10 in the main branch, so the next Poetry version will likely fix it.

[AndreaVidali]

Follow-up for any future readers: poetry 1.8.3 has been released, and the bug above should have been fixed given that pkginfo is now at 1.10: https://github.com/python-poetry/poetry/releases/tag/1.8.3