Cannot install (with mamba)

[renefritze]

Solution to issue cannot be found in the documentation.

• I checked the documentation.

Issue

When installing version 6.52.3 I get this error

Encountered problems while solving:
  - nothing provides exceptiongroup >=1.0.0rc8 needed by hypothesis-6.52.3-pyhd8ed1ab_0

This change apparently then is the culprit.

Is this maybe a problem with mamba? Since obviously the package/recipe build here succeeded without errors?

Installed packages

This is the base env

    Package              Version  Build               Channel                 Size
  ──────────────────────────────────────────────────────────────────────────────────
    Install:
  ──────────────────────────────────────────────────────────────────────────────────
  
    + bzip2                1.0.8  h0d85af4_4          conda-forge/osx-64     159kB
    + ca-certificates  2022.6.15  h033912b_0          conda-forge/osx-64     153kB
    + libffi               3.4.2  h0d85af4_5          conda-forge/osx-64      51kB
    + libzlib             1.2.12  hfe4f2af_2          conda-forge/osx-64      65kB
    + ncurses                6.3  h96cf925_1          conda-forge/osx-64     937kB
    + openssl              3.0.5  hfe4f2af_0          conda-forge/osx-64       3MB
    + pip                 22.2.1  pyhd8ed1ab_0        conda-forge/noarch       2MB
    + python              3.9.13  hf8d34f4_0_cpython  conda-forge/osx-64      13MB
    + python_abi             3.9  2_cp39              conda-forge/osx-64       4kB
    + readline             8.1.2  h3899abd_0          conda-forge/osx-64     272kB
    + setuptools          63.3.0  py39h6e9494a_0      conda-forge/osx-64       1MB
    + sqlite              3.39.2  hd9f0692_0          conda-forge/osx-64       2MB
    + tk                  8.6.12  h5dbffcc_0          conda-forge/osx-64       4MB
    + tzdata               2022a  h191b570_0          conda-forge/noarch     124kB
    + wheel               0.37.1  pyhd8ed1ab_0        conda-forge/noarch      32kB
    + xz                   5.2.5  haf1e3a3_1          conda-forge/osx-64     233kB
    + zlib                1.2.12  hfe4f2af_2          conda-forge/osx-64      95kB

Environment info

Best I can do for this is https://github.com/pymor/pymor/runs/7618149039?check_suite_focus=true#step:5:2

The error happens in all our macos, linux and windows builders. These all try to install the same packages, and all currently fail with above message.

[jochym]

Does it install with conda?

[renefritze]

I've setup a minimal Dockerfile to replicate my problem. That setup also cannot install hypothesis (with conda), but with a different problem

[renefritze]

So for some reason mamba does not consider the package with rc2 (latest in conda forge, current is rc8) for exceptiongroup to be installable. See here via this Dockerfile

pip install exceptiongroup

works however. There seems to be no way to make mamba accept pre-release versions.

Plain conda also fails to install exceptiongroup directly (w/o any version constraint).
Dockerfile and build result

Would it be alright with you @jochym to remove the dependency for exceptiongroup until they have a final, non-RC, release?

[renefritze]

Would it be alright with you @jochym to remove the dependency for exceptiongroup until they have a final, non-RC, release?

Just in case, I've prepared a PR for that.

[renefritze]

Since #733 made it clear to me that exceptiongroup is actually a hard dependency, I guess there's nothing really to be done for anybody who's using mamba, right?
Maybe pre-installing it with pip before using mamba to install hypothesis?