Method __len__

crates/vm/src/stdlib/_collections.rs:346–348

(&self)

        }

        fn __len__(&self) -> usize {
            self.borrow_deque().len()
        }

        fn concat(&self, other: &PyObject, vm: &VirtualMachine) -> PyResult<Self> {
            if let Some(o) = other.downcast_ref::<Self>() {