You can verify a script is syntactically correct by compiling it to an AST or just calling compile() which is another way of doing essentially what `import` does but without having to worry about import-related side-effects in the code being checked.

But is this really worth adding to the stdlib? You can run your tests to verify the code is syntactically sound, run pylint, etc. I think this is probably straying a bit too much into the tooling arena to make the maintenance burden worth having in the stdlib.