Linked List Phone Book:

def ll_insert(head, name, phone):
    new_node = {'name': name, 'phone' : phone, 'next': None}
    if head is None:
        return new_node
    if head['name'] == name:
        head['phone'] = phone
        return head
    current = head 
    while current['next'] is not None:
        if current['next']['name'] == name:
            current['next']['phone'] = phone
            return head
        current = current['next']
    current['next'] = new_node
    return head