chore(python): ensure virtualenv defaults to Python 3.7 for api and s…

…hared-data (#9708)

.github/actions/python/setup/action.yaml

@@ -4,6 +4,9 @@ inputs:
   project:
     description: 'Which project (by subdirectory) to set up'
     required: true
+  python-version:
+    description: "What Python version to use to create the project's virtual environment"
+    required: false
 runs:
   using: 'composite'
   steps:
@@ -18,4 +21,4 @@ runs:
         npm install --global [email protected]
         pip install pipenv==2021.5.29
     - shell: bash
-      run: 'make -C ${{ inputs.project }} setup'
+      run: 'make -C ${{ inputs.project }} setup OT_VIRTUALENV_VERSION=${{ inputs.python-version }}'

.github/workflows/api-test-lint-deploy.yaml

@@ -87,11 +87,14 @@ jobs:
       - uses: './.github/actions/python/setup'
         with:
           project: 'api'
+          python-version: ${{ matrix.python }}
       - if: ${{ matrix.with-ot-hardware == 'false' }}
         name: Test without opentrons_hardware
         run: |
           make -C api setup-ot2
           make -C api test-ot2
+        env:
+          OT_VIRTUALENV_VERSION: ${{ matrix.python }}
       - if: ${{ matrix.with-ot-hardware == 'true' }}
         name: Test with opentrons_hardware
         run: make -C api test

.github/workflows/shared-data-test-lint-deploy.yaml

@@ -70,6 +70,7 @@ jobs:
       - uses: './.github/actions/python/setup'
         with:
           project: 'shared-data/python'
+          python-version: ${{ matrix.python }}
       - name: 'set complex environment variables'
         uses: actions/[email protected]
         with:

scripts/python.mk

@@ -1,17 +1,21 @@
-# this may be set as an environment variable to select the version of
-# python to run if pyenv is not available. it should always be set to
-# point to a python3.7
+# This environment variable can be used to select a specific
+# Python executable to use to run pipenv. Note: pipenv will not
+# necessary select this Python to create its virtual environments.
 OT_PYTHON ?= python
 
+# This environment variable can be used to tell pipenv which
+# Python version to use for a project's virtual environment.
+# Defaults to Python 3.7, which is the version that runs on the OT-2.
+# https://pipenv.pypa.io/en/latest/basics/#specifying-versions-of-python
+OT_VIRTUALENV_VERSION ?= 3.7
 
 pipenv_envvars := $(and $(CI),PIPENV_IGNORE_VIRTUALENVS=1)
 pipenv := $(pipenv_envvars) $(OT_PYTHON) -m pipenv
 python := $(pipenv) run python
 pip := $(pipenv) run pip
 pytest := $(pipenv) run py.test
 
-
-pipenv_opts := --dev
+pipenv_opts := --dev $(and $(OT_VIRTUALENV_VERSION),--python $(OT_VIRTUALENV_VERSION))
 pipenv_opts += $(and $(CI),--keep-outdated --clear)
 wheel_opts := $(if $(and $(or $(CI),$(V),$(VERBOSE)),$(not $(QUIET))),,-q)