How Can I Install Python 3.7 on Apple Silicon (OSX-ARM64)?

Cannot Install Python 3.7 on osx-arm64

Problem:

When attempting to create a new environment with Python 3.7 using Conda, an error arises, indicating that Python 3.7 is unavailable for osx-arm64 (Apple Silicon).

Answer:

No Native Builds Available

Python 3.7 was never officially built for osx-arm64, as Apple Silicon was released after Python 3.8 had been available for a year.

Workaround: Emulation

Immediate alternatives for using Python 3.7 on Apple Silicon systems include using emulation through Rosetta or employing container systems like Docker.

Creating osx-64 Environments

To emulate x86_64 with Rosetta, create osx-64 environments in the following manner:

• Create an empty environment: conda create -n py37
• Activate the environment: conda activate py37
• Set the x86_64 architecture channel(s): conda config --env --set subdir osx-64
• Install Python and other packages: conda install python=3.7 numpy

YAML

An alternative is to use a YAML environment definition:

• Create an environment from YAML: CONDA_SUBDIR=osx-64 conda env create -n py37 -f py37.yaml
• Activate the environment: conda activate py37
• Set the x86_64 architecture channel(s): conda config --env --set subdir osx-64

Virtualization and Parallels

Instead of emulation, virtualization solutions like Parallels can also be utilized to run x86_64 programs in a virtualized environment on Apple Silicon hardware.

Long-Term Solution

Requesting a native build for python-feedstock to include Python 3.7 for osx-arm64 is a possibility, but it's unlikely to be taken up due to Python 3.7 being in its maintenance phase and dependencies not being available.

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