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Added length instance Variable in singly_linked_list to keep track of length while addition/deletion #5320

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Added length instance Variable in singly_linked_list to keep track of length while addition/deletion #5320

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8830527
Added length instance variable to keep track of length as items are …
symabbas Oct 15, 2021
a76fb2b
Added length instance variable to keep track of length as items are …
symabbas Oct 15, 2021
9512864
Merge https://github.com/symabbas/Python
symabbas Oct 15, 2021
51639bc
Added 'length' instance method to keep track of length while adding…
symabbas Oct 15, 2021
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7 changes: 4 additions & 3 deletions data_structures/linked_list/singly_linked_list.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ def __repr__(self):
class LinkedList:
def __init__(self):
self.head = None

self.length = 0
def __iter__(self):
node = self.head
while node:
Expand All @@ -36,8 +36,7 @@ def __len__(self) -> int:
>>> len(linked_list)
0
"""
return len(tuple(iter(self)))

return self.length
def __repr__(self):
"""
String representation/visualization of a Linked Lists
Expand Down Expand Up @@ -116,6 +115,7 @@ def insert_nth(self, index: int, data) -> None:
temp = temp.next
new_node.next = temp.next
temp.next = new_node
self.length += 1

def print_list(self) -> None: # print every node data
print(self)
Expand All @@ -138,6 +138,7 @@ def delete_nth(self, index: int = 0):
temp = temp.next
delete_node = temp.next
temp.next = temp.next.next
self.length -= 1
return delete_node.data

def is_empty(self) -> bool:
Expand Down