python - conda 4.7.7 -> 4.6 - 收集包元数据 (current_repodata.json) - (channel conda-forge) ipywidgets-5.2.3-py36_0 由于 InvalidSpec : ==1. *

Question

conda update 会阻止一切。

conda env-solving 花费了数小时甚至永远

可能是由于 conda 优化:
https://www.anaconda.com/why-we-removed-the-free-channel-in-conda-4-7/

但这打破了许多系统(如我的):
https://github.com/conda/conda/issues/8844

有错误，如

Collecting package metadata (current_repodata.json): - WARNING conda.models.version:get_matcher(531): Using .* with relational operator is superfluous and deprecated and will be removed in a future version of conda. Your spec was 1.*, but conda is ignoring the .* and treating it as 1
done
Solving environment: failed with current_repodata.json, will retry with next repodata source.
Initial quick solve with frozen env failed.  Unfreezing env and trying again.
Solving environment: failed with current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done

所以我降级为 conda=4.6

但得到

Collecting package metadata: / WARNING conda.core.index:push_record(193): Skipping conda-forge/label/broken/linux-64::ipywidgets-5.2.3-py36_0 due to InvalidSpec: ==1.*
WARNING conda.core.index:push_record(193): Skipping conda-forge/label/broken/linux-64::ipywidgets-5.2.3-py27_0 due to InvalidSpec: ==1.*
WARNING conda.core.index:push_record(193): Skipping conda-forge/label/broken/linux-64::ipywidgets-5.2.3-py35_0 due to InvalidSpec: ==1.*
done
Solving environment: failed

InvalidVersionSpec: Invalid version '==1.*': invalid operator with '.*'

和

conda install conda=4.7 
Collecting package metadata: failed

CondaUpgradeError: This environment has previously been operated on by a conda version that's newer
than the conda currently being used. A newer version of conda is required.
  target environment location: /home/aeug/conda
  current conda version: 4.6.0
  minimum conda version: 4.7

有什么可以再次修复系统/环境吗？

我能看到的只是用旧的 conda 4.6.11 https://repo.anaconda.com/miniconda/ 重新安装

conda install conda=4.6
conda config --set pip_interop_enabled True

我可以用一些错误重建环境，但花了大约 6 个小时。

Answer 1

这个解决方案帮助了我的系统，设置了 conda 配置参数 conda docs

conda config --set allow_conda_downgrades true
conda install conda=4.6.11

它再次正常工作。