Method expandtabs

crates/vm/src/builtins/str.rs:1346–1352

(&self, args: anystr::ExpandTabsArgs, vm: &VirtualMachine)

    #[pymethod]
    fn expandtabs(&self, args: anystr::ExpandTabsArgs, vm: &VirtualMachine) -> PyResult<String> {
        // TODO: support WTF-8
        Ok(rustpython_common::str::expandtabs(
            self.try_as_utf8(vm)?.as_str(),
            args.tabsize(),
        ))
    }

    #[pymethod]
    pub fn isidentifier(&self) -> bool {