Method exists

mypy/fscache.py:256–263

(self, path: str, real_only: bool = False)

        return stat.S_ISDIR(st.st_mode)

    def exists(self, path: str, real_only: bool = False) -> bool:
        st = self.stat_or_none(path)
        if st is None:
            return False
        if real_only:
            dirname = os.path.dirname(path)
            return dirname not in self.fake_package_cache
        return True

    def read(self, path: str) -> bytes:
        if path in self.read_cache: