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Since I have a mac with a M1 chip, I couldn't get Tensorflow installed using the regular version of anaconda, therefore, I installed conda using miniforge3-MacOSX-arm64.sh instead. However now I cannot create an environment with python 2.7.

conda create --name osmEnv python=2.7

I end up with the following error,

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

  - python=2.7

Current channels:

  - 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.

As suggested in the comments for adding a new channel (orginal question), I also tried using the anaconda channel,

conda create --name osmEnv -c anaconda python=2.7

Which resulted in the same error. Any ideas how to get python 2.7 installed.

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3
  • Use -c <channel name>. E.g. conda create -c conda-forge ... Commented May 4, 2021 at 7:18
  • Is this correct conda create -c conda-forge --name osmEnv python=2.7, didnt work though Commented May 4, 2021 at 7:24
  • 1
    Are you sure that there is a compatible Python version available through Conda? Commented May 14, 2021 at 15:19

1 Answer 1

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59

Not natively. Python 2.7 was sunsetted prior to release of the osx-arm64 platform, so there isn't any such build. One could try requesting such a build on the Conda Forge Python feedstock, but even if someone did that you'd still face the issue that most Python packages will also lack osx-arm64 builds for Python 2.7.

Emulate through Rosetta. Apple provides an x86_64 emulator, Rosetta 2, which will run x86_64 binaries, such as what would be installed with Conda environments using an osx-64 subdir. One can create environments with such a subdir setting with something like:

CONDA_SUBDIR=osx-64 conda create -n py27 python=2.7  # include other packages here

# ensure that future package installs in this env stick to 'osx-64'
conda activate py27
conda config --env --set subdir osx-64

Just be mindful to always have the environment activated when installing any additional packages. Rosetta should automatically kick in when launching python with such an environment activated.

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Just tested on M1 pro, seems to work decently!
@Hiram thanks for confirming. Please let me know if there's anything that could be clarified here.
Success create environment py27 with python=2.7, but when switch to py27, python --version still shows 3.9.7.
@Harrison Ensure that your environment is activated correctly (e.g., check PATH before and after). A more robust test that is not dependent on shell state would be conda run -n py27 python --version.
Sad that Python 2.7 doesn't have at least one legacy build on conda-forge. Nobody is looking for updates or support or new packages, just for a reproducible legacy environment available from a freely accessible channel.

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