Method rfind

crates/stdlib/src/mmap.rs:990–1004

(&self, options: FindOptions, vm: &VirtualMachine)

        #[pymethod]
        fn rfind(&self, options: FindOptions, vm: &VirtualMachine) -> PyResult<PyInt> {
            let (start, end) = self.get_find_range(options.clone());

            let sub = &options.sub;
            // returns start position for empty string
            if sub.is_empty() {
                return Ok(PyInt::from(start as isize));
            }

            let mmap = self.check_valid(vm)?;
            let buf = &mmap.as_ref().unwrap().as_slice()[start..end];
            let pos = buf.windows(sub.len()).rposition(|window| window == sub);

            Ok(pos.map_or(PyInt::from(-1isize), |i| PyInt::from(start + i)))
        }

        #[pymethod]
        fn flush(&self, options: FlushOptions, vm: &VirtualMachine) -> PyResult<()> {