Does an `import MacFSEvents` succeed inside of the brewed python interpreter?

Also note, even if `depends_on 'macfsevents' => :python` works as @mistydemeo  suggested, I recommend the new notion where the `:python` and the name of the module are reversed:
`depends_on :python => 'macfsevents'`. This allows to specify a different name on PyPI than for the `import <module>` check.