In Python please importing this code

class ListNode: """ Models a single node in a singly-linked list. Has no methods, other than the constructor. """

def __init__(self, val): """ Constructs the object; caller must pass a value, which will be stored in the 'val' field. """

self.val = val self.next = None

def __str__(self): vals = [] objs = set() curr = self while curr is not None: curr_str = str(curr.val) if curr in objs: vals.append("{} -> ... (to infinity and beyond)".format(curr_str)) break else: vals.append(curr_str) objs.add(curr) curr = curr.next

return " -> ".join(vals)

6 array_to_list (data) This function converts an array to a linked list. The parameter is an array of values (perhaps zero length); it must return a linked list, containing the same nodes, in the same order. This is the only function (as part of this Short Project) where you will create new nodes; remember, you can create a new ListNode object like this: obj = ListNode (val) where the parameter is the value that will be stored inside the node. Do not change the array that you were passed