feat: Add support for Python 3.9 across all backends (#1574)

* Add official support for Python 3.9 and add Python 3.9 to CI
   - Required PR #1001 to get Python 3.9 support of TensorFlow and TensorFlow Probability
* Add Python 3.9 support to PyPI metadata
* Update GitHub Actions workflows to use Python 3.9
   - .github/workflows/release_tests.yml will be updated after pyhf v0.6.3 is released
* Update Dockerfile to use python:3.9-slim-bullseye as base image

.github/workflows/ci.yml

@@ -15,10 +15,12 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        python-version: [3.7, 3.8]
+        python-version: [3.7, 3.8, 3.9]
         exclude:
           - os: macos-latest
             python-version: 3.7
+          - os: macos-latest
+            python-version: 3.8
 
     steps:
     - uses: actions/checkout@v2
@@ -37,7 +39,7 @@ jobs:
       run: |
         python -m pytest -r sx --ignore tests/benchmarks/ --ignore tests/contrib --ignore tests/test_notebooks.py
     - name: Report core project coverage with Codecov
-      if: github.event_name == 'push' && matrix.python-version == 3.8 && matrix.os == 'ubuntu-latest'
+      if: github.event_name == 'push' && matrix.python-version == 3.9 && matrix.os == 'ubuntu-latest'
       uses: codecov/codecov-action@v1
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
@@ -47,13 +49,13 @@ jobs:
       run: |
         python -m pytest -r sx tests/contrib --mpl --mpl-baseline-path tests/contrib/baseline
     - name: Report contrib coverage with Codecov
-      if: github.event_name == 'push' && matrix.python-version == 3.8 && matrix.os == 'ubuntu-latest'
+      if: github.event_name == 'push' && matrix.python-version == 3.9 && matrix.os == 'ubuntu-latest'
       uses: codecov/codecov-action@v1
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         file: ./coverage.xml
         flags: contrib
     - name: Run benchmarks
-      if: github.event_name == 'schedule' && matrix.python-version == 3.8
+      if: github.event_name == 'schedule' && matrix.python-version == 3.9
       run: |
         python -m pytest -r sx --benchmark-sort=mean tests/benchmarks/test_benchmark.py

.github/workflows/dependencies-head.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
     - uses: actions/checkout@v2
@@ -43,7 +43,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
     - uses: actions/checkout@v2
@@ -69,7 +69,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
     - uses: actions/checkout@v2
@@ -94,7 +94,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/docs.yml

@@ -13,13 +13,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
     - uses: actions/checkout@v2
       with:
         fetch-depth: 0
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}

.github/workflows/lint.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip setuptools wheel

.github/workflows/notebooks.yml

@@ -12,11 +12,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.8]
+        python-version: [3.9]
 
     steps:
     - uses: actions/checkout@v2
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}

.github/workflows/publish-package.yml

@@ -19,10 +19,10 @@ jobs:
       with:
         fetch-depth: 0
 
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
 
     - name: Install python-build, check-manifest, and twine
       run: |

.github/workflows/tag.yml

@@ -58,10 +58,10 @@ jobs:
       run: |
         git merge --squash "origin/${GITHUB_HEAD_REF}"
         git commit -m "${PR_TITLE} (#${PR_NUMBER})"
-    - name: Set up Python 3.8
+    - name: Set up Python 3.9
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: 3.9
     - name: Install bump2version
       run: |
         python -m pip install --upgrade pip setuptools wheel

codemeta.json

@@ -129,5 +129,5 @@
     "keywords": "physics fitting numpy scipy tensorflow pytorch jax",
     "developmentStatus": "4 - Beta",
     "applicationCategory": "Scientific/Engineering, Scientific/Engineering :: Physics",
-    "programmingLanguage": "Python 3, Python 3.7, Python 3.8, Python Implementation CPython"
+    "programmingLanguage": "Python 3, Python 3.7, Python 3.8, Python 3.9, Python Implementation CPython"
 }

docker/Dockerfile

@@ -1,4 +1,4 @@
-ARG BASE_IMAGE=python:3.8-slim-bullseye
+ARG BASE_IMAGE=python:3.9-slim-bullseye
 # hadolint ignore=DL3006
 FROM ${BASE_IMAGE} as base
 

setup.cfg

@@ -24,6 +24,7 @@ classifiers =
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
+    Programming Language :: Python :: 3.9
     Programming Language :: Python :: Implementation :: CPython
 
 [options]