feat: add CPython 3.10 pre-release support (#675)

* Add CPython 3.10 support

* Fix logger displaying CPython 3.1 instead of 3.10

* Fix tests failing with CPython 3.10

* Use pytest instead of nose

* feat: --pre flag

Apply suggestions from code review

Co-authored-by: Matthieu Darbois <mayeut@users.noreply.github.com>

* fix: update Python update script to process beta versions

* refactor: prerelease-pythons

* Use `strtobool` to parse `CIBW_PRERELEASE_PYTHONS` env var

* Update python version filtering for universal2 & arm64

* Filter out CPython 3.10 and above for `test_manylinuxXXXX_only[manylinux1]` test

* Use CIBW_BUILD filtering rather than CIBW_SKIP for test_docker_images

* Use skip_patterns to filter out pre-releases

* Use `prerelease_pythons` instead of `pre`

* Reword `CIBW_PRERELEASE_PYTHONS` doc per review.

* Use `CIBW_PRERELEASE_PYTHONS: True` for usage example.

* Update `cibuildwheel --help` doc

* docs: add note on spec.filter

* Clean up the BuildSelector __repr__ by refactoring

* fix: remove platform variants for CIBW_PRERELEASE_PYTHONS

* docs: mention the flag

Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Joe Rickerby <joerick@mac.com>

test/test_docker_images.py

@@ -37,7 +37,7 @@ def test(tmp_path):
         add_env={
             "CIBW_MANYLINUX_X86_64_IMAGE": "dockcross/manylinux2010-x64",
             "CIBW_MANYLINUX_I686_IMAGE": "dockcross/manylinux2010-x86",
-            "CIBW_SKIP": "pp* cp39-*",
+            "CIBW_BUILD": "cp3{6,7,8,9}-*",
         },
     )
 
@@ -49,6 +49,6 @@ def test(tmp_path):
     expected_wheels = [
         w
         for w in utils.expected_wheels("spam", "0.1.0", manylinux_versions=["manylinux2010"])
-        if "-pp" not in w and "-cp39-" not in w
+        if "-cp36-" in w or "-cp37-" in w or "-cp38-" in w or "-cp39-" in w
     ]
     assert set(actual_wheels) == set(expected_wheels)