Python 2.7 在osx-arm64平台发布之前就被淘汰了，所以没有任何这样的构建,且大多数 Python 包也将缺少Python 2.7 的osx-arm64构建。

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conda create -n python27 python=2.7


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=2.7

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

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.

解决方法

通过 Rosetta 模拟。Apple 提供了一个 x86_64 模拟器Rosetta 2，它将运行 x86_64 二进制文件。

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CONDA_SUBDIR=osx-64 conda create -n py27 python=2.7

参考链接

Anaconda channel for installing python 2.7