Macos 使用 conda 创建 python3.7 虚拟环境失败

Macos M1 芯片，Anaconda使用 conda create -n py37 python=3.7 时，出现：

Collecting package metadata (current_repodata.json): done
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed

PackagesNotFoundError: The following packages are not available from current channels:

  - python=3.7

Current channels:

  - https://repo.anaconda.com/pkgs/main/osx-arm64
  - https://repo.anaconda.com/pkgs/main/noarch
  - https://repo.anaconda.com/pkgs/r/osx-arm64
  - https://repo.anaconda.com/pkgs/r/noarch
  - https://conda.anaconda.org/conda-forge/osx-arm64
  - https://conda.anaconda.org/conda-forge/noarch

To search for alternate channels that may provide the conda package you're
looking for, navigate to

    https://anaconda.org

and use the search bar at the top of the page.

是因为 对于 M1 芯片的 Macos，不支持 python3.8 一下的 python 版本。如果实在需要安装 python3.7，请按以下步骤：

• conda create -n py37：创建名为 py37 的虚拟环境

• conda activate py37：激活 py37 的虚拟环境

• conda config --env --set subdir osx-64：使用 x86_64 架构的 channel

• conda install python=3.7：安装 ptyhon3.7

参考

• Env creation from python 3.7 not working M1 Apple Silicon Mac (Miniconda 3)

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