Update README #898

	name: Lint

	on:
	workflow_dispatch:
	pull_request:
	push:
	branches:
	- main

	jobs:
	black:
	name: Python Formatting With Black
	runs-on: ubuntu-latest
	steps:
	- name: Checking out repository
	uses: actions/checkout@8f4b7f84864484a7bf31766abe9204da3cbe65b3 # v3.5.0
	- name: Setting up python
	uses: actions/setup-python@d27e3f3d7c64b4bbf8e4abfb9b63b83e846e0435 # v4.5.0
	- name: Fetching Base Branch
	# We have to explicitly fetch the base branch as well
	run: git fetch --no-tags --prune --depth=1 origin "${GITHUB_BASE_REF?}:${GITHUB_BASE_REF?}"
	- name: Install black
	run: \|
	python3 -m pip install black
	- name: Check if modified files are formatted
	run: \|
	# The filter lowercase `d` means to exclude deleted files.
	git diff "${GITHUB_BASE_REF?}" --name-only --diff-filter=d \
	-- '*.py' \
	\| xargs --no-run-if-empty black --check --diff --verbose
	- name: Instructions for fixing the above linting errors
	if: failure()
	run: \|
	printf "You can fix formatting by running 'black' on the modified python files:\n"
	printf " git diff ${GITHUB_BASE_REF?} --name-only -- '*.py' ':!third_party' \| xargs black\n"

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