Method index

crates/vm/src/builtins/memory.rs:771–806

(
        &self,
        value: PyObjectRef,
        start: OptionalArg<isize>,
        stop: OptionalArg<isize>,
        vm: &VirtualMachine,
    )

    #[pymethod]
    fn index(
        &self,
        value: PyObjectRef,
        start: OptionalArg<isize>,
        stop: OptionalArg<isize>,
        vm: &VirtualMachine,
    ) -> PyResult<usize> {
        self.try_not_released(vm)?;
        if self.desc.ndim() != 1 {
            return Err(
                vm.new_not_implemented_error("multi-dimensional sub-views are not implemented")
            );
        }
        let len = self.desc.dim_desc[0].0;
        let start = start.unwrap_or(0);
        let stop = stop.unwrap_or(len as isize);

        let start = if start < 0 {
            (start + len as isize).max(0) as usize
        } else {
            (start as usize).min(len)
        };
        let stop = if stop < 0 {
            (stop + len as isize).max(0) as usize
        } else {
            (stop as usize).min(len)
        };

        for i in start..stop {
            let item = self.getitem_by_idx(i as isize, vm)?;
            if vm.bool_eq(&item, &value)? {
                return Ok(i);
            }
        }
        Err(vm.new_value_error("memoryview.index(x): x not in memoryview"))
    }

    fn cast_to_1d(&self, format: PyUtf8StrRef, vm: &VirtualMachine) -> PyResult<Self> {
        let format_str = format.as_str();