add regression tests for target branch python_test_env_upgrade #4515

	name: Linting

	on: [push, pull_request]

	jobs:
	pylint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Install pylint
	run: \|
	python -m pip install --upgrade pip
	pip install pylint==2.16.1
	- name: Run pylint
	run: \|
	pylint algorithmic_efficiency
	pylint reference_algorithms
	pylint prize_qualification_baselines
	pylint submission_runner.py
	pylint tests

	isort:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Install isort
	run: \|
	python -m pip install --upgrade pip
	pip install isort
	- name: Run isort
	run: \|
	isort . --check --diff

	yapf:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Python 3.9
	uses: actions/setup-python@v2
	with:
	python-version: 3.9
	- name: Install yapf
	run: \|
	python -m pip install --upgrade pip
	pip install yapf==0.32
	- name: Run yapf
	run: \|
	yapf . --diff --recursive

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