[Backport 1.6.latest] Drop support for Python 3.8 (#1382)

* drop support for python 3.8

.changes/unreleased/Breaking Changes-20241016-185117.yaml

@@ -0,0 +1,6 @@
+kind: Breaking Changes
+body: Drop support for Python 3.8
+time: 2024-10-16T18:51:17.581547-04:00
+custom:
+  Author: mikealfare
+  Issue: "1373"

.github/scripts/integration-test-matrix.js

@@ -1,6 +1,6 @@
 module.exports = ({ context }) => {
-  const defaultPythonVersion = "3.8";
-  const supportedPythonVersions = ["3.8", "3.9", "3.10", "3.11"];
+  const defaultPythonVersion = "3.9";
+  const supportedPythonVersions = ["3.9", "3.10", "3.11"];
   const supportedAdapters = ["bigquery"];
 
   // if PR, generate matrix based on files changed and PR labels

.github/workflows/main.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '3.9'
 
       - name: Install python dependencies
         run: |
@@ -71,7 +71,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11']
 
     env:
       TOXENV: "unit"
@@ -127,7 +127,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.8'
+          python-version: '3.9'
 
       - name: Install python dependencies
         run: |
@@ -174,7 +174,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-12, windows-latest]
-        python-version: ['3.8', '3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11']
 
     steps:
       - name: Set up Python ${{ matrix.python-version }}

.pre-commit-config.yaml

@@ -20,14 +20,14 @@ repos:
     additional_dependencies: ['click~=8.1']
     args:
     - "--line-length=99"
-    - "--target-version=py38"
+    - "--target-version=py39"
   - id: black
     alias: black-check
     stages: [manual]
     additional_dependencies: ['click~=8.1']
     args:
     - "--line-length=99"
-    - "--target-version=py38"
+    - "--target-version=py39"
     - "--check"
     - "--diff"
 - repo: https://github.com/pycqa/flake8

CONTRIBUTING.md

@@ -67,7 +67,7 @@ $EDITOR test.env
 There are a few methods for running tests locally.
 
 #### `tox`
-`tox` takes care of managing Python virtualenvs and installing dependencies in order to run tests. You can also run tests in parallel, for example you can run unit tests for Python 3.8, Python 3.9, and `flake8` checks in parallel with `tox -p`. Also, you can run unit tests for specific python versions with `tox -e py38`. The configuration of these tests are located in `tox.ini`.
+`tox` takes care of managing Python virtualenvs and installing dependencies in order to run tests. You can also run tests in parallel, for example you can run unit tests for Python 3.9 and `flake8` checks in parallel with `tox -p`. Also, you can run unit tests for specific python versions with `tox -e py38`. The configuration of these tests are located in `tox.ini`.
 
 #### `pytest`
 Finally, you can also run a specific test or group of tests using `pytest` directly. With a Python virtualenv active and dev dependencies installed you can do things like:

Makefile

@@ -19,8 +19,3 @@ ubuntu-py311: ## Builds and runs an Ubuntu Python 3.11 development container
 ubuntu-py39: ## Builds and runs an Ubuntu Python 3.9 development container
 	docker build -f docker_dev/ubuntu.Dockerfile -t dbt-bigquery-ubuntu-py39 . --build-arg version=3.9
 	docker run --rm -it --name dbt-bigquery-ubuntu-py39 -v $(shell pwd):/opt/code dbt-bigquery-ubuntu-py39
-
-.PHONY: ubuntu-py38
-ubuntu-py38: ## Builds and runs an Ubuntu Python 3.8 development container
-	docker build -f docker_dev/ubuntu.Dockerfile -t dbt-bigquery-ubuntu-py38 . --build-arg version=3.8
-	docker run --rm -it --name dbt-bigquery-ubuntu-py38 -v $(shell pwd):/opt/code dbt-bigquery-ubuntu-py38

setup.py

@@ -2,9 +2,9 @@
 import sys
 
 # require a supported version of Python
-if sys.version_info < (3, 8):
+if sys.version_info < (3, 9):
     print("Error: dbt does not support this version of Python.")
-    print("Please upgrade to Python 3.8 or higher.")
+    print("Please upgrade to Python 3.9 or higher.")
     sys.exit(1)
 
 try:
@@ -90,10 +90,9 @@ def _dbt_core_version(plugin_version: str) -> str:
         "Operating System :: Microsoft :: Windows",
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: POSIX :: Linux",
-        "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
     ],
-    python_requires=">=3.8",
+    python_requires=">=3.9",
 )

tox.ini

@@ -1,8 +1,8 @@
 [tox]
 skipsdist = True
-envlist = py38,py39,py310,py311
+envlist = py39,py310,py311
 
-[testenv:{unit,py38,py39,py310,py311,py}]
+[testenv:{unit,py39,py310,py311,py}]
 description = unit testing
 skip_install = true
 passenv =
@@ -13,7 +13,7 @@ deps =
   -rdev-requirements.txt
   -e.
 
-[testenv:{integration,py38,py39,py310,py311,py}-{bigquery}]
+[testenv:{integration,py39,py310,py311,py}-{bigquery}]
 description = adapter plugin integration testing
 skip_install = true
 passenv =
@@ -33,7 +33,7 @@ deps =
   -rdev-requirements.txt
   -e.
 
-[testenv:{python-tests,py38,py39,py310,py311,py}]
+[testenv:{python-tests,py39,py310,py311,py}]
 description = python integration testing
 skip_install = true
 passenv =