CPython provides a NuGet package as a mechanism to support non-installed Python distributions. The package includes MSBuild support to integrate with its build process.

The expressions on lines 32 and 33 in the file:

https://github.com/python/cpython/blob/master/PC/layout/support/props.py

are both missing closing parentheses, which results in literal text instead of the resolve file paths. This appears to be introduced in version 3.7.2 of the package onward, including the current pre-release 3.9.0-a5.

In addition, several build conditions use the form " $(Property) == 'value' ", but should instead use " '$(Property)' == 'value' ". By not surrounding the property value with '', the condition may resolve as "  == '' ", which is an invalid expression and will cause a build failure. This doesn't appear to have caused an issue yet, but it easily could.

If there is no further discussion or objection, I can submit a PR with the required fixes.