Ad-hoc SQL query builder for Python3?

[Rich Shepard]

My web searches are not finding what I need to include in an application I'm
building: an ad-hoc sql query builder.

End users will want to query their data for reports not included in the
built-in queries. My searches find a windows-only tool that apparently costs
developers for the version to include in their applications. I'm looking for
a F/OSS tool and I'm sure these are available somewhere.

Suggestions are needed.

TIA,

Rich