dumb.py

class LinkedList:

    def __init__(self):
        self.elements = {}
        self.head = None

    def add(self, e):
        if not self.elements:
            self.head = e

        else:
            current = self.head
            while self.elements[current] is not None:
                current = self.elements[current]
            self.elements[current] = e

        self.elements[e] = None

    def __iter__(self):
        self._current = self.head
        return self

    def __next__(self):
        if self._current is None:
            raise StopIteration
        current = self._current
        self._current = self.elements[self._current]
        return current


# Oops this is stupid and not needed
# class LLIter:
#   def __init__(self, list):
#       self.list = list
#       self.current = list.head
#
#   def __iter__(self):
#       return self
#
#   def __next__(self):
#       if self.current is None:
#           raise StopIteration
#       current = self.current
#       self.current = self.list.elements[self.current]
#       return current


ll = LinkedList()

ll.add("butt")
ll.add("head")
ll.add("oof")

print(ll.head)
print(ll.elements[ll.head])
print(ll.elements[ll.elements[ll.head]])


for item in ll:
    print(item)