Check if Python 3.10.0 available for Mac and Windows.

[charris]

No description provided.

[tupui]

If it's not available yet on Azure, we should still be able to build wheels with the following no?

Suggested change

	PYTHON_VERSION: "3.10-dev"
	AZURE_PYTHON_VERSION: "3.9"
	PYTHON_VERSION: "3.10"

Suggested change

	PYTHON_VERSION: "3.10-dev"
	PYTHON_VERSION: "3.10-dev"

[rgommers]

Conclusion is "not available"?

[hugovk]

Correct, the -dev versions are installed on-demand, and on-demand isn't available for Azure Pipelines, unlike GitHub Actions (also the reason 3.10 isn't available for AZP until pre-cached images are deployed).

• *Add Python 3.10 (release) actions/runner-images#4226 (comment)

Here's the feature request to 👍 upvote for AZP to be able to install on-demand:

• Improve UsePython to allow installation versions on-flight  microsoft/azure-pipelines-tasks#13319

(Upvoting suggested by a GitHub employee, so they must pay attention to upvotes:
actions/runner-images#1740 (comment))

[charris]

Conclusion is "not available"?

I deleted this in favor of #135. As of yesterday evening, Windows 64 bits works, Windows 32 bits was missing, and Mac needed Python.h. Not sure about the last, it might have been moved...