python:3.7-alpine3.12 can not install python-dev

[smalyshev]

Trying to install python-dev on the image python:3.7-alpine3.12:

/ # apk add --no-cache python-dev
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
  python-dev (missing):
    required by: world[python-dev]

Same on python:3.7-alpine3.11:

/ # apk add --no-cache python-dev
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.11/community/x86_64/APKINDEX.tar.gz
(1/3) Installing pkgconf (1.6.3-r0)
(2/3) Installing python2 (2.7.18-r0)
(3/3) Installing python2-dev (2.7.18-r0)
Executing busybox-1.31.1-r9.trigger
OK: 61 MiB in 37 packages

[wglambert]

There isn't a python-dev in the apk repo's https://pkgs.alpinelinux.org/packages?name=python-dev&branch=v3.12

You'd want python3-dev https://pkgs.alpinelinux.org/packages?name=python3-dev&branch=v3.12

[tianon]

Really, you don't want either of those packages inside any images maintained here -- these images contain Python built from source, while those packages will pull in Alpine's Python, so you'll have two different Python installations installed in your image.