chore: drop python 3.6 for cibuildwheel driver

This drops python 3.6 for cibuildwheel.
Building python 3.6 packages is still supported.

.circleci/config.yml

@@ -1,7 +1,7 @@
 version: 2
 
 jobs:
-  osx-python3.6:
+  osx-python3.9:
     macos:
       xcode: 12.5.1
     environment:
@@ -17,9 +17,9 @@ jobs:
           command: venv/bin/python ./bin/run_tests.py
           no_output_timeout: 30m
 
-  linux-python3.6:
+  linux-python3.9:
     docker:
-      - image: circleci/python:3.6
+      - image: circleci/python:3.9
     environment:
       PYTHON: python3
       # Temporarily restrict the tests that are run on CircleCI to prevent
@@ -41,5 +41,5 @@ workflows:
   version: 2
   all-tests:
     jobs:
-      - osx-python3.6
-      - linux-python3.6
+      - osx-python3.9
+      - linux-python3.9

.pre-commit-config.yaml

@@ -17,12 +17,6 @@ repos:
   rev: v2.37.1
   hooks:
   - id: pyupgrade
-    name: PyUpgrade 3.6+
-    args: ["--py36-plus"]
-    exclude: ^bin/
-  - id: pyupgrade
-    name: PyUpgrade 3.7+ on bin
-    exclude: ^(cibuildwheel|unit_test|test)/
     args: ["--py37-plus"]
 
 # Autoremoves unused imports
@@ -52,9 +46,9 @@ repos:
   rev: v0.961
   hooks:
   - id: mypy
-    name: mypy 3.6 on cibuildwheel/
-    exclude: ^(bin|cibuildwheel/resources|docs)/.*py$
-    args: ["--python-version=3.6"]
+    name: mypy 3.7 on cibuildwheel/
+    exclude: ^cibuildwheel/resources/.*py$
+    args: ["--python-version=3.7"]
     additional_dependencies: &mypy-dependencies
       - nox
       - packaging>=21.0
@@ -70,11 +64,6 @@ repos:
       - types-requests
       - bracex
       - dataclasses
-  - id: mypy
-    name: mypy 3.7+ on bin/
-    files: ^((bin|docs)/.*py)$
-    args: ["--python-version=3.7"]
-    additional_dependencies: *mypy-dependencies
   - id: mypy
     name: mypy 3.10
     args: ["--python-version=3.10"]

.travis.yml

@@ -8,21 +8,21 @@ branches:
 
 jobs:
   include:
-    - name: Linux | x86_64 + i686 | Python 3.6
-      python: 3.6
+    - name: Linux | x86_64 + i686 | Python 3.7
+      python: 3.7
       services: docker
       env: PYTHON=python
 
-    - name: Linux | arm64 | Python 3.6
-      python: 3.6
+    - name: Linux | arm64 | Python 3.7
+      python: 3.7
       services: docker
       arch: arm64-graviton2
       group: edge
       virt: vm
       env: PYTHON=python
 
-    - name: Linux | ppc64le | Python 3.6
-      python: 3.6
+    - name: Linux | ppc64le | Python 3.7
+      python: 3.7
       services: docker
       arch: ppc64le
       allow_failure: True
@@ -32,18 +32,18 @@ jobs:
         # c.f. https://travis-ci.community/t/running-out-of-disk-space-quota-when-using-docker-on-ppc64le/11634
         - PYTEST_ADDOPTS='-k "not test_manylinuxXXXX_only"'
 
-    - name: Windows | x86_64 | Python 3.6
+    - name: Windows | x86_64 | Python 3.7
       os: windows
       language: shell
       before_install:
-        - choco upgrade python3 -y --version 3.6.8 --limit-output
+        - choco upgrade python3 -y --version 3.7.9 --limit-output
         # Update root certificates to fix SSL error; see http://www.chawn.com/RootCerts.htm
         - powershell "md C:\temp\certs; CertUtil -generateSSTFromWU C:\temp\certs\RootStore.sst; Get-ChildItem -Path C:\\temp\certs\Rootstore.sst | Import-Certificate -CertStoreLocation Cert:\\LocalMachine\\Root\\ | out-null"
       env:
-        - PYTHON=C:\\Python36\\python
+        - PYTHON=C:\\Python37\\python
 
-    - name: Linux | s390x | Python 3.6
-      python: 3.6
+    - name: Linux | s390x | Python 3.7
+      python: 3.7
       services: docker
       arch: s390x
       env: PYTHON=python

CI.md

@@ -1,11 +1,11 @@
 This is a summary of the Python versions and platforms covered by the different CI platforms:
 
-|          | 3.6                          | 3.7                         | 3.8              |
-|----------|------------------------------|-----------------------------|------------------|
-| Linux    | Travis CI / CircleCI         | AppVeyor¹ / GitHub Actions  | Azure Pipelines  |
-| macOS    | CircleCI                     | AppVeyor¹ / GitHub Actions  | Azure Pipelines  |
-| Windows  | Travis CI / Azure Pipelines  | AppVeyor¹ / GitHub Actions  | Azure Pipelines  |
+|          | 3.7                   | 3.8                       | 3.9      | 3.10           |
+|----------|-----------------------|---------------------------|----------|----------------|
+| Linux    | AppVeyor¹ / Travis CI | Azure Pipelines / GitLab  | CircleCI | GitHub Actions |
+| macOS    | AppVeyor¹ / Travis CI | Azure Pipelines           | CircleCI | GitHub Actions |
+| Windows  | AppVeyor¹ / Travis CI | Azure Pipelines           |          | GitHub Actions |
 
 > ¹ AppVeyor only runs the "basic" test to reduce load.
 
-Non-x86 architectures are covered on Travis CI using Python 3.6.
+Non-x86 architectures are covered on Travis CI using Python 3.7.

azure-pipelines.yml

@@ -20,17 +20,6 @@ jobs:
         python -m pip install -e ".[dev]" pytest-azurepipelines
         python ./bin/run_tests.py
 
-- job: windows_36
-  pool: {vmImage: 'windows-2019'}
-  timeoutInMinutes: 180
-  steps:
-    - task: UsePythonVersion@0
-      inputs:
-        versionSpec: '3.6'
-    - bash: |
-        python -m pip install -e ".[dev]" pytest-azurepipelines
-        python ./bin/run_tests.py
-
 - job: windows_38
   pool: {vmImage: 'windows-2019'}
   timeoutInMinutes: 180

bin/update_dependencies.py

@@ -1,5 +1,4 @@
 #!/usr/bin/env python3
-# This file supports 3.6+
 
 import os
 import shutil

cibuildwheel/bashlex_eval.py

@@ -9,9 +9,7 @@ EnvironmentExecutor = Callable[[List[str], Dict[str, str]], str]
 
 
 def local_environment_executor(command: List[str], env: Dict[str, str]) -> str:
-    return subprocess.run(
-        command, env=env, universal_newlines=True, stdout=subprocess.PIPE, check=True
-    ).stdout
+    return subprocess.run(command, env=env, text=True, stdout=subprocess.PIPE, check=True).stdout
 
 
 @dataclass(frozen=True)

docs/contributing.md

@@ -94,7 +94,6 @@ This has been moved to using docker, so you only need the following instructions
 The dependency update script in the next section requires multiple python versions installed. One way to do this is to use `pyenv`:
 
 ```bash
-pyenv install 3.6.11
 pyenv install 3.7.8
 # Optionally add 3.8 and make it the local version;
 # otherwise assuming 3.8+ already is your current python version
@@ -103,7 +102,6 @@ pyenv install 3.7.8
 Then, you need to make the required virtual environments:
 
 ```bash
-$(pyenv prefix 3.6.11)/bin/python -m venv env36
 $(pyenv prefix 3.7.8)/bin/python -m venv env37
 ```
 

examples/circleci-minimal.yml

@@ -4,7 +4,7 @@ jobs:
   linux-wheels:
     working_directory: ~/linux-wheels
     docker:
-      - image: circleci/python:3.6
+      - image: circleci/python:3.9
     steps:
       - checkout
       - setup_remote_docker

examples/travis-ci-test-and-deploy.yml

@@ -9,7 +9,6 @@ os: linux
 dist: focal
 language: python
 python:
-  - 3.6
   - 3.7
   - 3.8
 

pyproject.toml

@@ -8,7 +8,7 @@ build-backend = "setuptools.build_meta"
 
 [tool.black]
 line-length = 100
-target-version = ['py36', 'py37', 'py38', 'py39', 'py310']
+target-version = ['py37', 'py38', 'py39', 'py310']
 
 
 [tool.isort]
@@ -88,7 +88,7 @@ ignore = [
 ]
 
 [tool.pylint]
-master.py-version = "3.6"
+master.py-version = "3.7"
 master.jobs = "0"
 master.fail-on = ["E", "F"]
 master.fail-under = "9.8"

setup.cfg

@@ -16,7 +16,6 @@ classifiers =
     Natural Language :: English
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3 :: Only
-    Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
@@ -37,10 +36,9 @@ install_requires =
     filelock
     packaging>=20.9
     platformdirs
-    dataclasses;python_version < '3.7'
     tomli;python_version < '3.11'
     typing-extensions>=3.10.0.0;python_version < '3.8'
-python_requires = >=3.6
+python_requires = >=3.7
 include_package_data = True
 zip_safe = False
 

test/test_macos_archs.py

@@ -17,7 +17,7 @@ ALL_MACOS_WHEELS = {
 def get_xcode_version() -> Tuple[int, int]:
     output = subprocess.run(
         ["xcodebuild", "-version"],
-        universal_newlines=True,
+        text=True,
         check=True,
         stdout=subprocess.PIPE,
     ).stdout

test/utils.py

@@ -35,7 +35,7 @@ def cibuildwheel_get_build_identifiers(project_path, env=None, *, prerelease_pyt
 
     cmd_output = subprocess.run(
         cmd,
-        universal_newlines=True,
+        text=True,
         env=env,
         check=True,
         stdout=subprocess.PIPE,

unit_test/oci_container_test.py

@@ -83,7 +83,7 @@ def test_container_removed(container_engine):
             shell=True,
             check=True,
             stdout=subprocess.PIPE,
-            universal_newlines=True,
+            text=True,
         ).stdout
         assert container.name is not None
         assert container.name in docker_containers_listing
@@ -94,7 +94,7 @@ def test_container_removed(container_engine):
         shell=True,
         check=True,
         stdout=subprocess.PIPE,
-        universal_newlines=True,
+        text=True,
     ).stdout
     assert old_container_name not in docker_containers_listing