Updating tests and doc to support Python 3.10 (dbt-labs#5025)

* Updating tests and doc to support Python 3.10

* Single quotes needed for python version matrix

* Adding changelog

.changes/unreleased/Under the Hood-20220411-103724.yaml

@@ -0,0 +1,7 @@
+kind: Under the Hood
+body: Updating tests and docs to show that we now support Python 3.10
+time: 2022-04-11T10:37:24.806649-04:00
+custom:
+  Author: leahwicz
+  Issue: "4974"
+  PR: "5025"

.github/workflows/main.yml

@@ -68,7 +68,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
 
     env:
       TOXENV: "unit"
@@ -112,7 +112,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ['3.7', '3.8', '3.9', '3.10']
         os: [ubuntu-latest]
         include:
           - python-version: 3.8

CONTRIBUTING.md

@@ -103,7 +103,7 @@ There are some tools that will be helpful to you in developing locally. While th
 
 A short list of tools used in `dbt-core` testing that will be helpful to your understanding:
 
-- [`tox`](https://tox.readthedocs.io/en/latest/) to manage virtualenvs across python versions. We currently target the latest patch releases for Python 3.7, Python 3.8, and Python 3.9
+- [`tox`](https://tox.readthedocs.io/en/latest/) to manage virtualenvs across python versions. We currently target the latest patch releases for Python 3.7, Python 3.8, Python 3.9, and Python 3.10
 - [`pytest`](https://docs.pytest.org/en/latest/) to discover/run tests
 - [`make`](https://users.cs.duke.edu/~ola/courses/programming/Makefiles/Makefiles.html) - but don't worry too much, nobody _really_ understands how make works and our Makefile is super simple
 - [`flake8`](https://flake8.pycqa.org/en/latest/) for code linting
@@ -203,7 +203,7 @@ suites.
 
 #### `tox`
 
-[`tox`](https://tox.readthedocs.io/en/latest/) takes care of managing virtualenvs and install dependencies in order to run tests. You can also run tests in parallel, for example, you can run unit tests for Python 3.7, Python 3.8, and Python 3.9 checks in parallel with `tox -p`. Also, you can run unit tests for specific python versions with `tox -e py37`. The configuration for these tests in located in `tox.ini`.
+[`tox`](https://tox.readthedocs.io/en/latest/) takes care of managing virtualenvs and install dependencies in order to run tests. You can also run tests in parallel, for example, you can run unit tests for Python 3.7, Python 3.8, Python 3.9, and Python 3.10 checks in parallel with `tox -p`. Also, you can run unit tests for specific python versions with `tox -e py37`. The configuration for these tests in located in `tox.ini`.
 
 #### `pytest`
 

Dockerfile.test

@@ -46,6 +46,9 @@ RUN apt-get update \
     python3.9 \
     python3.9-dev \
     python3.9-venv \
+    python3.10 \
+    python3.10-dev \
+    python3.10-venv \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 

core/setup.py

@@ -82,6 +82,7 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
     ],
     python_requires=">=3.7.2",
 )

plugins/postgres/setup.py

@@ -82,6 +82,7 @@ def _dbt_psycopg2_name():
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
+        "Programming Language :: Python :: 3.10",
     ],
     python_requires=">=3.7",
 )