Azure-pipelines-tasks: UsePythonVersion works intermittently on OSX

[lasote]

I'm used azure pipelines with hosted agents.

The UsePythonVersion almost always fail. Sometimes it passes but the most common is:

2018-09-18T14:50:39.0415520Z ##[section]Starting: UsePythonVersion
2018-09-18T14:50:39.0541990Z ==============================================================================
2018-09-18T14:50:39.0555580Z Task         : Use Python Version
2018-09-18T14:50:39.0569210Z Description  : Retrieves the specified version of Python from the tool cache. Optionally add it to PATH.
2018-09-18T14:50:39.0582830Z Version      : 0.138.1
2018-09-18T14:50:39.0596300Z Author       : Microsoft Corporation
2018-09-18T14:50:39.0610040Z Help         : [More Information](https://go.microsoft.com/fwlink/?linkid=871498)
2018-09-18T14:50:39.0623750Z ==============================================================================
2018-09-18T14:50:39.5198080Z ##[error]Version spec 2.7.15 for architecture x64 did not match any version in the tool cache.
Available versions:


2018-09-18T14:50:39.5692590Z ##[section]Finishing: UsePythonVersion

Build link here: https://conanci.visualstudio.com/Conan/_build/results?buildId=70&view=logs

A related issue here: https://github.com/Microsoft/vsts-tasks/issues/8330

[bryanmacfarlane]

It looks like the hosted mac image doesn't have? Odd that it's intermittent

[bryanmacfarlane]

@brcrista ?

[lasote]

The docs and Mac agent properties say that it has 2.7, 3.6.5 and other versions:

macOS toolcache Python 2.7.15 3.4.8 3.5.5 3.6.5 3.7.0

Here is a link to a build that worked: https://conanci.visualstudio.com/Conan/_build/results?buildId=69&view=logs

[brcrista]

It appears there are some macOS agents in the hosted pool that don't have Python installed. Let me follow up with the team that manages that pool.

[lasote]

Apparently now is working.

[brcrista]

Turns out the WEU region had some VMs that had not been updated. This should be fixed as of yesterday. Please reactivate if you continue to see the issue.