🔒 How do I make this LinkedList work

[crimson umbra]

class LinkedList:
# TODO: items needs a default value that IS NOT mutable
# e.g. DO NOT use an empty list
def init(self, items=None):
'initialize a new LinkedList w/ optional collection items'
if items is None:
self.items = []
_len = len(items)
else:
self.items = items

def add_first(self, item):
    'adds item to beginning of linked list'

    # create a new node pointed at self._head
    self._head = item

    # update self._head
    item = _head

    # update len
    _len = len(items)

[sacred topaz]

Hey @crimson umbra!

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[sacred topaz]

@crimson umbra

Python help channel opened

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[crimson umbra]

[rare dawn]

Do you have any test cases?

[crimson umbra]

    'Test cases specific to LinkedList Class'

    def test_1_init(self):
        'initialize with or without a collection'
        # Initialize empty LL
        ll1 = LinkedList()
        self.assertEqual(len(ll1), 0)

        # Initialize an LL w/ 10 items
        ll2 = LinkedList(range(10))
        self.assertEqual(len(ll2), 10)

        L = [item for item in ll2]
        self.assertEqual(L, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9])

    def test_2_add_remove_first(self):
        'adds and removes 100 items to/from beginning of LL'
        ll1 = LinkedList()
        n = 100

        # repeat a few times to make sure removing the last item doesn't break
        # anything
        for j in range(10):

            for i in range(n):
                self.assertEqual(len(ll1), i)
                ll1.add_first(i)

            for i in range(n):
                self.assertEqual(len(ll1), n-i)
                self.assertEqual(ll1.remove_first(), n-1-i)

[rare dawn]

Is this a homework?

[crimson umbra]

yeah

I've been trying to figure this out for a few days

[rare dawn]

Do you you see how you could implement __init__ by calling self.add_first multiple times?

[crimson umbra]

I don't

Could you explain

[sacred topaz]

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