Upgrade tutorial to Python 3 and make installable via pip install

.pre-commit-config.yaml

@@ -0,0 +1,37 @@
+## Pre-commit hooks (https://pre-commit.com/).
+
+repos:
+- repo: https://github.com/pre-commit/pre-commit-hooks
+  rev: v4.3.0
+  hooks:
+  - id: check-builtin-literals
+  - id: check-case-conflict
+  - id: check-docstring-first
+  - id: check-executables-have-shebangs
+  - id: check-json
+  - id: check-merge-conflict
+  - id: check-shebang-scripts-are-executable
+  - id: check-symlinks
+  - id: check-toml
+  - id: check-xml
+  - id: check-yaml
+    args: [--allow-multiple-documents]
+  - id: debug-statements
+  - id: destroyed-symlinks
+  - id: end-of-file-fixer
+  - id: fix-byte-order-marker
+  - id: mixed-line-ending
+  - id: trailing-whitespace
+    args: [--markdown-linebreak-ext=md]
+- repo: https://github.com/PyCQA/isort
+  rev: 5.10.1
+  hooks:
+  - id: isort
+- repo: https://github.com/psf/black
+  rev: 22.6.0
+  hooks:
+  - id: black
+- repo: https://github.com/shellcheck-py/shellcheck-py
+  rev: v0.8.0.4
+  hooks:
+  - id: shellcheck