Multidict Package Problematic in python:slim

[joswr1ght]

I wanted to check out the Microblog application and I tried to build it with Docker, but it looks like the multidict package is problematic in python:slim:

$ docker build -t microblog:latest .
[+] Building 33.5s (7/13)                                                                          docker:desktop-linux
 => [internal] load .dockerignore                                                                                  0.0s
 => => transferring context: 2B                                                                                    0.0s
 => [internal] load build definition from Dockerfile                                                               0.0s
 => => transferring dockerfile: 374B                                                                               0.0s
 => [internal] load metadata for docker.io/library/python:slim                                                     0.3s
 => [1/9] FROM docker.io/library/python:slim@sha256:db7e9284d53f7b827c58a6239b9d2907c33250215823b1cdb7d1e983e70da  0.0s
 => [internal] load build context                                                                                  0.0s
 => => transferring context: 3.31kB                                                                                0.0s
 => CACHED [2/9] COPY requirements.txt requirements.txt                                                            0.0s
 => ERROR [3/9] RUN pip install -r requirements.txt                                                               33.1s
------
...
32.65   Building wheel for multidict (pyproject.toml): started
32.80   Building wheel for multidict (pyproject.toml): finished with status 'error'
32.81   error: subprocess-exited-with-error
32.81
32.81   × Building wheel for multidict (pyproject.toml) did not run successfully.
32.81   │ exit code: 1
32.81   ╰─> [77 lines of output]
32.81       *********************
32.81       * Accelerated build *
32.81       *********************
32.81       running bdist_wheel
32.81       running build
32.81       running build_py
32.81       creating build
32.81       creating build/lib.linux-x86_64-cpython-312
32.81       creating build/lib.linux-x86_64-cpython-312/multidict
32.81       copying multidict/_abc.py -> build/lib.linux-x86_64-cpython-312/multidict
32.81       copying multidict/_multidict_base.py -> build/lib.linux-x86_64-cpython-312/multidict
32.81       copying multidict/_multidict_py.py -> build/lib.linux-x86_64-cpython-312/multidict
32.81       copying multidict/_compat.py -> build/lib.linux-x86_64-cpython-312/multidict
32.81       copying multidict/__init__.py -> build/lib.linux-x86_64-cpython-312/multidict
32.81       running egg_info
32.81       writing multidict.egg-info/PKG-INFO
32.81       writing dependency_links to multidict.egg-info/dependency_links.txt
32.81       writing top-level names to multidict.egg-info/top_level.txt
32.81       reading manifest file 'multidict.egg-info/SOURCES.txt'
32.81       reading manifest template 'MANIFEST.in'
32.81       warning: no previously-included files matching '*.pyc' found anywhere in distribution
32.81       warning: no previously-included files found matching 'multidict/_multidict.html'
32.81       warning: no previously-included files found matching 'multidict/*.so'
32.81       warning: no previously-included files found matching 'multidict/*.pyd'
32.81       warning: no previously-included files found matching 'multidict/*.pyd'
32.81       no previously-included directories found matching 'docs/_build'
32.81       adding license file 'LICENSE'
32.81       writing manifest file 'multidict.egg-info/SOURCES.txt'
32.81       /tmp/pip-build-env-g9hma3yk/overlay/lib/python3.12/site-packages/setuptools/command/build_py.py:207: _Warning: Package 'multidict._multilib' is absent from the `packages` configuration.
32.81       !!
32.81
32.81               ********************************************************************************
32.81               ############################
32.81               # Package would be ignored #
32.81               ############################
32.81               Python recognizes 'multidict._multilib' as an importable package[^1],
32.81               but it is absent from setuptools' `packages` configuration.
32.81
32.81               This leads to an ambiguous overall configuration. If you want to distribute this
32.81               package, please make sure that 'multidict._multilib' is explicitly added
32.81               to the `packages` configuration field.
32.81
32.81               Alternatively, you can also rely on setuptools' discovery methods
32.81               (for example by using `find_namespace_packages(...)`/`find_namespace:`
32.81               instead of `find_packages(...)`/`find:`).
32.81
32.81               You can read more about "package discovery" on setuptools documentation page:
32.81
32.81               - https://setuptools.pypa.io/en/latest/userguide/package_discovery.html
32.81
32.81               If you don't want 'multidict._multilib' to be distributed and are
32.81               already explicitly excluding 'multidict._multilib' via
32.81               `find_namespace_packages(...)/find_namespace` or `find_packages(...)/find`,
32.81               you can try to use `exclude_package_data`, or `include-package-data=False` in
32.81               combination with a more fine grained `package-data` configuration.
32.81
32.81               You can read more about "package data files" on setuptools documentation page:
32.81
32.81               - https://setuptools.pypa.io/en/latest/userguide/datafiles.html
32.81
32.81
32.81               [^1]: For Python, any directory (with suitable naming) can be imported,
32.81                     even if it does not contain any `.py` files.
32.81                     On the other hand, currently there is no concept of package data
32.81                     directory, all directories are treated like packages.
32.81               ********************************************************************************
32.81
32.81       !!
32.81         check.warn(importable)
32.81       copying multidict/__init__.pyi -> build/lib.linux-x86_64-cpython-312/multidict
32.81       copying multidict/py.typed -> build/lib.linux-x86_64-cpython-312/multidict
32.81       creating build/temp.linux-x86_64-cpython-312
32.81       creating build/temp.linux-x86_64-cpython-312/multidict
32.81       gcc -fno-strict-overflow -Wsign-compare -DNDEBUG -g -O3 -Wall -fPIC -I/usr/local/include/python3.12 -c multidict/_multidict.c -o build/temp.linux-x86_64-cpython-312/multidict/_multidict.o -O2 -std=c99 -Wall -Wsign-compare -Wconversion -fno-strict-aliasing -pedantic
32.81       error: command 'gcc' failed: No such file or directory
32.81       [end of output]
32.81
32.81   note: This error originates from a subprocess, and is likely not a problem with pip.
32.81   ERROR: Failed building wheel for multidict
32.81 Successfully built Flask-Mail langdetect
32.82 Failed to build multidict
32.82 ERROR: Could not build wheels for multidict, which is required to install pyproject.toml-based projects

I was able to work around this by changing the FROM target to python:3.11-alpine:

$ git diff
diff --git a/Dockerfile b/Dockerfile
index 972b18b..7fe6683 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,5 @@
-FROM python:slim
+# FROM python:slim
+FROM python:3.11-alpine

 COPY requirements.txt requirements.txt
 RUN pip install -r requirements.txt

[miguelgrinberg]

The issue is that this package has not released a wheel package for Python 3.12 yet. Switching to Python 3.11 should address this.