[Backport 1.6.latest] Drop support for Python 3.8 (#934)

* drop support for python 3.8

* drop support for python 3.8

.changes/unreleased/Breaking Changes-20241016-190600.yaml

@@ -0,0 +1,6 @@
+kind: Breaking Changes
+body: Drop support for Python 3.8
+time: 2024-10-16T19:06:00.668396-04:00
+custom:
+  Author: mikealfare
+  Issue: "931"

.github/workflows/integration.yml

@@ -68,10 +68,8 @@ jobs:
       max-parallel: 3
       matrix:
         os: [ubuntu-22.04, macos-12, windows-2022]
-        python-version: ["3.8"]
+        python-version: ["3.9"]
         include:
-          - os: ubuntu-22.04
-            python-version: "3.9"
           - os: ubuntu-22.04
             python-version: "3.10"
           - os: ubuntu-22.04
@@ -168,7 +166,7 @@ jobs:
       fail-fast: false
       max-parallel: 1
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11"]
 
     env:
       TOXENV: integration-redshift

.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: |
@@ -70,7 +70,7 @@ 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-22.04, macos-12, windows-2022]
-        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

@@ -18,7 +18,6 @@ repos:
     -   id: black
         args:
         -   --line-length=99
-        -   --target-version=py38
         -   --target-version=py39
         -   --target-version=py310
         -   --target-version=py311

CONTRIBUTING.md

@@ -70,7 +70,7 @@ $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, Python 3.10, 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 Python 3.10, and `flake8` checks in parallel with `tox -p`. Also, you can run unit tests for specific python versions with `tox -e py39`. 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

@@ -38,22 +38,22 @@ linecheck: ## Checks for all Python lines 100 characters or more
 	find dbt -type f -name "*.py" -exec grep -I -r -n '.\{100\}' {} \;
 
 .PHONY: unit
-unit: ## Runs unit tests with py38.
+unit: ## Runs unit tests with py39.
 	@\
-	tox -e py38
+	tox -e py39
 
 .PHONY: test
-test: ## Runs unit tests with py38 and code checks against staged changes.
+test: ## Runs unit tests with py39 and code checks against staged changes.
 	@\
-	tox -p -e py38; \
+	tox -p -e py39; \
 	pre-commit run black-check --hook-stage manual | grep -v "INFO"; \
 	pre-commit run flake8-check --hook-stage manual | grep -v "INFO"; \
 	pre-commit run mypy-check --hook-stage manual | grep -v "INFO"
 
 .PHONY: integration
-integration: ## Runs redshift integration tests with py38.
+integration: ## Runs redshift integration tests with py39.
 	@\
-	tox -e py38-redshift --
+	tox -e py39-redshift --
 
 .PHONY: clean
 	@echo "cleaning repo"

setup.py

@@ -1,9 +1,9 @@
 #!/usr/bin/env python
 import sys
 
-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)
 
 
@@ -97,10 +97,9 @@ def _core_version(plugin_version: str = _plugin_version()) -> 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}-{redshift}]
+[testenv:{integration,py39,py310,py311,py}-{redshift}]
 description = adapter plugin integration testing
 skip_install = true
 passenv =